10xAlliance developers bundle for knife(1 game 15€)

Just an fyi. Those are all incredibly cheap games that have been bundled a million times before. Most are worth .10 cents IF that.
Steam store prices have very little importance given the amount of games that go on sale and in bundles.
I would suggest googling Enhanced Steam plugin , it will help you get a better sense of game values and prices for trade.

If you need any help feel free to ask.

Cheers.