So where to buy Delisted games?

Are there any trustworthy sites to buy delisted games you recommend? I want to buy Ninja Blade but found out it was delisted from Steam so I'm trying to track it down and add it to my game collection.

@davillain:

green man gaming

Anyone use G2A? They have good prices on a lot of delisted stuff, but I have never made a purchase there.

Buy? forget that it's not worth putting your money at risk.

Found it, thanks. I normally do business with CDKey but never thought green man gaming still sells delisted games.