Rite Aid has many good sales. I used to wait for their 40% off sales on Revlon and L'Oreal.

I also used to buy makeup from Facebook groups and blog sales. I was a beauty blogger, and I would always keep an eye out for fellow bloggers who were looking to unload unused makeup. It was a great way to obtain sold out MAC and NARS makeup. If you don't feel uncomfortable getting gently used makeup, that is one option.