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you're not gonna find a lot of support for grey market sites here

What discount duration? None of them are stores. Key sellers, individuals post keys at prices they want to set. Whenever G2A posts a "sale" or "discount", they just take a random game that has a seemingly low price and pretend it is on sale. This also means the "sale" lasts as long as someone takes all the keys the seller had left.

Prey is a great game, and Arkane is a great studio. It would be nice if people bought it from an authorized reseller so that the devs get compensated and we show that there absolutely is a market for immersive singleplayer games.

Weekend + Valentine's day discounts

I'd be pretty offended if someone got me a game from G2A as a Valentine's gift. Like, "I love you enough to buy you Civ 6, but not enough to pay more than 2 euros for it" :x

cdkeys is legit asf. They seem to operate on a supply and demand system. When they go on the site the price is lower. As it gets closer to the launch date, the higher the price gets. Same with after release.