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https://www.humblebundle.com/membership?refc=Psdx0Z$12 / month Humble Choice gets you a handful of surprise games a month. Past notable ones were Borderlands Wonderlands, Prodeus, Deep Rock, Doom, Jurassic World Evolution 2, Death Stranding, etc.
The best thing about it is you is after 6 months you get 20% off most of the catalog and when there's sales you'll get some stuff cheaper than Steam sales. For example: Elden Ring is $28 for me when on Steam it's $35 during the Winter sales.
I subscribed mainly to build up my library for my Steam Deck after going on a hiatus from Steam. Previously I bought a ton of Humble Bundles 10 years ago which is why the library is big.