diff --git a/code/_helpers/atmospherics.dm b/code/_helpers/atmospherics.dm
index ec309d81cf4..1d050f4deae 100644
--- a/code/_helpers/atmospherics.dm
+++ b/code/_helpers/atmospherics.dm
@@ -13,4 +13,9 @@
 
 /proc/print_atmos_analysis(user, var/list/result)
 	for(var/line in result)
-		to_chat(user, "<span class='notice'>[line]</span>")
\ No newline at end of file
+		to_chat(user, "<span class='notice'>[line]</span>")
+
+/proc/GetGasDatum(gas_id)
+	if(!(gas_id in gas_data.gases))
+		return null
+	return gas_data.gases[gas_id]
diff --git a/code/modules/hydroponics/seed.dm b/code/modules/hydroponics/seed.dm
index eed07e72002..762a2bc7518 100644
--- a/code/modules/hydroponics/seed.dm
+++ b/code/modules/hydroponics/seed.dm
@@ -861,3 +861,45 @@
 		res.overlays += I
 
 	return res
+
+/datum/seed/proc/Value(check_chems = TRUE)
+	. = 5
+	for(var/trait in traits)
+		var/trait_value = get_trait(trait)
+		if(!trait_value)
+			continue
+
+		switch(trait)
+			if(TRAIT_POTENCY)
+				. += trait_value * 0.4
+			if(TRAIT_EXPLOSIVE)
+				. += 15
+			if(TRAIT_HARVEST_REPEAT)
+				. += 15
+			if(TRAIT_PRODUCTION)
+				. += trait_value
+			if(TRAIT_YIELD)
+				. += trait_value
+			if(TRAIT_MATURATION)
+				. -= trait_value
+			if(TRAIT_ENDURANCE)
+				. += trait_value * 0.25
+			if(TRAIT_JUICY)
+				. += trait_value * 5
+			if(TRAIT_STINGS)
+				. += 15
+
+		for(var/gas_id in exude_gasses)
+			var/decl/xgm_gas/gas = GetGasDatum(gas_id)
+			if(!istype(gas))
+				continue
+			. += gas.value * exude_gasses[gas_id]
+
+		if(check_chems)
+			for(var/chem in chems)
+				var/datum/reagent/R = GLOB.chemical_reagents_list[chem]
+				if(!istype(R))
+					continue
+				. += R.value * chems[chem]
+
+	. = round(max(2, .))
diff --git a/code/modules/item_worth/value_procs.dm b/code/modules/item_worth/value_procs.dm
index 3ef203f4d6c..797f5e9366d 100644
--- a/code/modules/item_worth/value_procs.dm
+++ b/code/modules/item_worth/value_procs.dm
@@ -91,3 +91,29 @@
 	. += length(allowed_spells * 1000)
 	if(!isnull(owner))
 		. *= 0.5
+
+/obj/item/reagent_containers/food/snacks/grown/Value(base)
+	. = ..()
+	. += seed.Value(FALSE)
+
+// Seeds cost less than fully grown plants
+/obj/item/seeds/Value(base)
+	. = ..()
+	. += round(seed.Value(TRUE) * 0.3)
+
+/obj/item/tank/Value(base)
+	. = ..()
+	for(var/gas_id in air_contents.gas)
+		var/decl/xgm_gas/gas = GetGasDatum(gas_id)
+		if(!istype(gas))
+			continue
+		. += gas.value * air_contents.gas[gas_id]
+
+// Mostly for canisters
+/obj/machinery/portable_atmospherics/Value(base)
+	. = ..()
+	for(var/gas_id in air_contents.gas)
+		var/decl/xgm_gas/gas = GetGasDatum(gas_id)
+		if(!istype(gas))
+			continue
+		. += gas.value * air_contents.gas[gas_id]
diff --git a/code/modules/item_worth/worths_list.dm b/code/modules/item_worth/worths_list.dm
index 7f3a0d35248..575762b4983 100644
--- a/code/modules/item_worth/worths_list.dm
+++ b/code/modules/item_worth/worths_list.dm
@@ -300,8 +300,8 @@ var/list/worths = list(
 					/obj/item/melee/classic_baton = 40,
 					/obj/item/melee/telebaton = 100,
 					/obj/item/excalibur = 5000,
-					/obj/item/tank/jetpack = 450,
-					/obj/item/tank = 50,
+					/obj/item/tank/jetpack = -250,
+					/obj/item/tank = -50,
 					/obj/item/contraband/poster = 25,
 //MATERIAL,
 					/obj/item/material/sword/katana/replica = -120,
diff --git a/code/modules/xgm/gases.dm b/code/modules/xgm/gases.dm
index 902182cb921..568d52b5711 100644
--- a/code/modules/xgm/gases.dm
+++ b/code/modules/xgm/gases.dm
@@ -7,6 +7,7 @@
 	breathed_product = /datum/reagent/oxygen
 	symbol_html = "O<sub>2</sub>"
 	symbol = "O2"
+	value = 4
 
 
 /decl/xgm_gas/nitrogen
@@ -16,6 +17,7 @@
 	molar_mass = 0.028	// kg/mol
 	symbol_html = "N<sub>2</sub>"
 	symbol = "N2"
+	value = 2
 
 /decl/xgm_gas/carbon_dioxide
 	id = GAS_CO2
@@ -24,6 +26,7 @@
 	molar_mass = 0.044	// kg/mol
 	symbol_html = "CO<sub>2</sub>"
 	symbol = "CO2"
+	value = 4
 
 /decl/xgm_gas/methyl_bromide
 	id = GAS_METHYL_BROMIDE
@@ -33,6 +36,7 @@
 	breathed_product = /datum/reagent/toxin/methyl_bromide
 	symbol_html = "CH<sub>3</sub>Br"
 	symbol = "CH3Br"
+	value = 8
 
 /decl/xgm_gas/phoron
 	id = GAS_PHORON
@@ -53,6 +57,7 @@
 	breathed_product = /datum/reagent/toxin/phoron
 	symbol_html = "Ph"
 	symbol = "Ph"
+	value = 12
 
 /decl/xgm_gas/sleeping_agent
 	id = GAS_N2O
@@ -63,6 +68,7 @@
 	breathed_product = /datum/reagent/nitrous_oxide
 	symbol_html = "N<sub>2</sub>O"
 	symbol = "N2O"
+	value = 3
 
 /decl/xgm_gas/methane
 	id = GAS_METHANE
@@ -72,6 +78,7 @@
 	flags = XGM_GAS_FUEL
 	symbol_html = "CH<sub>4</sub>"
 	symbol = "CH4"
+	value = 3
 
 /decl/xgm_gas/alium
 	id = GAS_ALIEN
@@ -79,6 +86,7 @@
 	hidden_from_codex = TRUE
 	symbol_html = "X"
 	symbol = "X"
+	value = 20
 
 /decl/xgm_gas/alium/New()
 	var/num = rand(100,999)
@@ -109,18 +117,21 @@
 	burn_product = GAS_STEAM
 	symbol_html = "H<sub>2</sub>"
 	symbol = "H2"
+	value = 10
 
 /decl/xgm_gas/hydrogen/deuterium
 	id = GAS_DEUTERIUM
 	name = "Deuterium"
 	symbol_html = "D"
 	symbol = "D"
+	value = 10
 
 /decl/xgm_gas/hydrogen/tritium
 	id = GAS_TRITIUM
 	name = "Tritium"
 	symbol_html = "T"
 	symbol = "T"
+	value = 15
 
 /decl/xgm_gas/helium
 	id = GAS_HELIUM
@@ -131,6 +142,7 @@
 	breathed_product = /datum/reagent/helium
 	symbol_html = "He"
 	symbol = "He"
+	value = 7
 
 /decl/xgm_gas/argon
 	id = GAS_ARGON
@@ -139,6 +151,7 @@
 	molar_mass = 0.018	// kg/mol
 	symbol_html = "Ar"
 	symbol = "Ar"
+	value = 25
 
 // If narcosis is ever simulated, krypton has a narcotic potency seven times greater than regular airmix.
 /decl/xgm_gas/krypton
@@ -148,6 +161,7 @@
 	molar_mass = 0.036	// kg/mol
 	symbol_html = "Kr"
 	symbol = "Kr"
+	value = 25
 
 /decl/xgm_gas/neon
 	id = GAS_NEON
@@ -156,6 +170,7 @@
 	molar_mass = 0.01	// kg/mol
 	symbol_html = "Ne"
 	symbol = "Ne"
+	value = 10
 
 /decl/xgm_gas/xenon
 	id = GAS_XENON
@@ -165,6 +180,7 @@
 	breathed_product = /datum/reagent/nitrous_oxide/xenon
 	symbol_html = "Xe"
 	symbol = "Xe"
+	value = 10
 
 /decl/xgm_gas/nitrodioxide
 	id = GAS_NO2
@@ -186,6 +202,7 @@
 	flags = XGM_GAS_OXIDIZER
 	symbol_html = "NO"
 	symbol = "NO"
+	value = 15
 
 /decl/xgm_gas/chlorine
 	id = GAS_CHLORINE
@@ -198,6 +215,7 @@
 	breathed_product = /datum/reagent/toxin/chlorine
 	symbol_html = "Cl"
 	symbol = "Cl"
+	value = 7
 
 /decl/xgm_gas/vapor
 	id = GAS_STEAM
@@ -211,6 +229,7 @@
 	condensation_point =   308.15 // 35C. Dew point is ~20C but this is better for gameplay considerations.
 	symbol_html = "H<sub>2</sub>O"
 	symbol = "H2O"
+	value = 1
 
 /decl/xgm_gas/sulfurdioxide
 	id = GAS_SULFUR
@@ -220,6 +239,7 @@
 	molar_mass = 0.044	// kg/mol
 	symbol_html = "SO<sub>2</sub>"
 	symbol = "SO2"
+	value = 12
 
 /decl/xgm_gas/ammonia
 	id = GAS_AMMONIA
@@ -230,6 +250,7 @@
 	breathed_product = /datum/reagent/ammonia
 	symbol_html = "NH<sub>3</sub>"
 	symbol = "NH3"
+	value = 1
 
 /decl/xgm_gas/carbon_monoxide
 	id = GAS_CO
@@ -239,3 +260,4 @@
 	breathed_product = /datum/reagent/carbon_monoxide
 	symbol_html = "CO"
 	symbol = "CO"
+	value = 5
diff --git a/code/modules/xgm/xgm_gas_data.dm b/code/modules/xgm/xgm_gas_data.dm
index 46c76985ab8..481a411380d 100644
--- a/code/modules/xgm/xgm_gas_data.dm
+++ b/code/modules/xgm/xgm_gas_data.dm
@@ -51,6 +51,8 @@
 	var/symbol_html = "X"
 	var/symbol = "X"
 
+	/// Cost per mole
+	var/value = 0
 
 /hook/startup/proc/generateGasData()
 	gas_data = new