Hello. I know I rarely post here, but this is something special.
CheapShark.com is a service that unlike G2A, Instant Games, etc. lets you get games cheaper by sorting deals on the Internet, however they show only those that are offered by official distributors.
And how is that special?
Yes, the deals might not be as good as those on G2A or similar, but by buying from official sources, you will support the developers, and not shady CD key sellers.