A few super cheap, not-new games I’ve played that aren’t on the main promo banner:
Aragami - $3 - Pretty challenging stealth game. The sequel is also on sale, but I hear it’s more action-oriented, less stealth-oriented than the original.
X3: Reunion - $2 - Sid Meier’s Mount & Blade, but in spaaaaaaace. (I’ve only played the sequel, X4. But this one looks kind of similar, and is two dollars.)
Tom Clancy’s Rainbow Six - $2.50 - Tactical FPS. Been a while since I’ve played it. Was definitely cool when it came out.
A few super cheap, not-new games I’ve played that aren’t on the main promo banner: