whether you wear a little or a lot, one thing i believe strongly in is application brushes for makeup. you can find good quality brushes at stores like Walgreens or Target. My favorite place to go brush shopping, though?
I often express to people that I have to go paint my face. And I'm not lying. I use rigger brushes, and angle brushes. Filberts and Mops. It's rare to be able to find a paintbrush the size of a Powder Brush, so I get those from the cosmetic department.
But for a few dollars, sometimes half the price of cosmetic brushes, I've preferred paintbrushes for years. Especially the angle brushes for lining eyes.