I found this article from Total Beauty on the best inexpensive eye liners to be rather interesting. Most of my personal favorites are under $10, although I must admit that I love a few of the MAC liners that come in over that amount. I also adore Make Up Forever Aqua Eyes liners. The shade range on those is incredible!
I also adore cream and gel liners applied with a brush, and sadly none of that type are on the list. For a great gel liner close to$10 (it is $12) look at the L’Oreal HIP Color Rich Cream Eyeliner.