I can get these 3 for 3tf2 keys
https://www.kinguin.net/category/73748/deeeer-simulator-your-average-everyday-deer-game-pc-steam-cd-key
https://www.kinguin.net/category/137656/the-good-life-2021-pc-steam-cd-key
https://www.kinguin.net/category/83006/the-sealed-ampoule-steam-cd-key
Platform 8 and The Exit 8 is only on steam at full price