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It REALLY varies from card to card, but see this.

And note that most people will try to lowball you with cards worth 6c post-tax.

The value depends on the steam market, which works like any other market depending on supply and demand. So main place is to look there, although i find it very disorganised, u need to know what u are looking for before hand. You can also look at a graph of the sales by clicking 'sell' from your inventory. Alternatively, I have a firefox addon called enhanced steam which adds various helpful tools to the steam site, including current card prices when viewing which cards i have fora particular badge.

I used to trade with cards a lot. I generally shorted cards into 4+1 categories.

(sorry my currency is euro but I hope you get the idea)

• Unsellable tier - 0.03-0.04 euros (e.g. Awesomenauts, Orion Dino Horde)

• Low tier - 0.05-0.06 euros (e.g. TF2, Terraria, Garry's Mod, Guacamelee usually these cards sell the most quick)

• Mid tier - 0.07-0.09 euros (e.g. Payday 1-2, Risen 2, Binding of Isaac, Saints Row the Third)

• Top tier - 0.09-0.14 euros (e.g. Borderlands 2, Portal 2, Skyrim, Bioshock Infinite, Rust, Bastion)

+1 Rarities - any cards above 0.14 euros (e.g. Loadout, Puddle)

Foil cards greatly vary in price from 0.19 (terraria, magicka) to 0.74 (TF2) to even 10 euros.

I usually counted Booster packs as three cards of value, but some consider it more valuable because they might drop a foil card (I've yet to see any though)

Anyway thats my guide, hope it helped.