I picked up one of these babies [v-neck, short-sleeve] at Wal-mart for 5 bucks. I never feel sweaty in it and the color never fades. The material doesn't shrink either. It's super comfy and figure flattering, too!
Danskin offers a great bargain when it comes to active wear. their shorts are made nicely, fit well, & last--all for only around 10 bucks!! i have several pairs & use them often and they're still like new!