I buy games on sale a lot. Frequently, a game looks really neat but overpriced. I get a lot of games from bundles. And through those games, find others. Most recently, I found AfterImage from a bundle because im into metroidvanias. And looking that game up, read about other recommendations that are now on my wishlist.

For other games, Rock paper Shotgun is my preferred source. They give a lot of attention to indie games.