S.T.A.L.K.E.R. Shadow of Chernobyl, is it worth the 20$?

The S.T.A.L.K.E.R. series is one of the best of all time IMO, easily the best atmosphere I've ever played through, better than Bioshock or any others that always get high praise. I definitely do think it is worth $20, but the summer sale is right around the corner so if you can wait, I'd just say wait a month or so to get it even cheaper.

I got it from a $10 Amazon bundle, and I got lots of other games with it. Go and check Amazon.

Find someone to trade with.

Wait for summer sales and buy Shadow of Chernobyl and Clear Sky.

Yeah it's worth even 20 USD, wait for the summer sale nonetheless

Lol, this is hilarious.
Price: $19.99 / 6,99€
They reversed the pricing. :P

It'll drop to $5 this summmer sale. I'd say wait for it.

It's a really good game, but like others have said, you're better off waiting for it to go on sale. You should also check various trading forums -- I've seen it go for as low as $1 before, and you can likely pick it up for only a couple of bucks if you can find someone who still has an extra key.

Is the game worth $20? Yes.
Can you get it cheaper than that? Yes.
Will it be discounted for Steam's Summer Sale? Highly likely.