The Yogscast Jingle Jam! They do an annual month long Livestream where they play games and raise money for a variety of charities. Donations of 35 pounds or more also get a whole bevy of game keys as part of the collection that can be redeemed on steam. You can see the list of games or donate at jinglejam.tiltify.com
I got a Litter Robot 3 a couple years ago and its the best money I’ve spent in a long while. Super convenient and I haven’t had any issues with it even with 2 cats.