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Itch, I guess! It's mostly DRM-free, but there are still games that offer Steam keys with your purchase.

g2a™ ^^

Voidu

Regular coupons which apply even to newer games - which make them sometimes the cheapest store, normally no region restrictions and a negligible bit of cashback.

Instant Gaming easily has the best service and prices.

plati . ru

like the russian amazon for games, i love it!
basically the platform where all the other shops get their keys from^^

Why should we have a "favorite" reseller? Why do people feel compelled to tie themselves to a brand? As a customer, it's always better to have more businesses to pick from.
I like all resellers equally (except those who use Big Brother Google ReCaptcha), and at any point in time, the one I like best is the one that provides the best price for the game I'm buying. 👀

it WAS humble bundle, but its looking like its dead

Humble bundle is at the very top, but i prefer instant gamingo r g2a

Nuuvem in South America has amazing prices ;)

Fanatical for me. Sometimes I visit the little GreenMan. I almost never buy on HB anymore. Seems their prices are always way higher than anywhere else and since they don't do bundles anymore...
Gamesplanet has good deals on Ubisoft games sometimes too.

Despite my better judgement, Humble. Fanatical has also grown into a rather good store. I also quite like GamesPlanet and Voidu.

Kinguin all the way