Steam market.

I'd dare to say this is not the place for this.

google might help point you in the right direction

In brief hunt for them, I couldn't find better prices than on the Steam market. Also, Paypal support and no risk of scams.

In my back lawn.

If I sell it in the market I get more money (including the fee). The problem is that is credit in the store not money. But you see my point. Steamtrades doesn't hhelp you?

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And a wild key appears!

You're probably not going to find anyone selling for less than $1.75 these days, and even then most people are selling at $1.80 or $1.85.

Google it, it would have been much easier and faster than posting here.

Better look by yourself.