I don't wear foundation, but I want to do something about the dark circles under my eyes, any suggestions for good brands, where to get them, how to choose, etc?

Thank you!

The best concealer is Mac Studio Stick
http://www.maccosmetics.com/templates/products/sp.tmpl?CATEGORY_ID=CATEGORY15106&PRODUCT_ID=PROD3 665
which is about $16, but is AMAZING!

BUT...
if you dont want to spend a lot on one makeup item...
Try L'Oreal True Match, its almost as good, and cheaper!
http://www.drugstore.com/products/prod.asp?pid=179709&catid=9569&cmbProdBrandFilter= 42837

Good Luck!

mac make-up is amazing. but it is pretty expensive.
loreal is a cheaper but just as great. and since you want to get rid of the dark circles chose a color a little lighter than your actual skin tone.