I'm a big thrift store shopper. I love them! I love being able to find great deals, especially on things for running or related to running. Within the last couple of weeks, I have scored two great deals. One, was a running store skirt, which sells online for $65. I got it for just $4 at the thrift store. Then this week I found a Life is Good run shirt and it was only $1.69.
If you want some new running clothing and don't want to spend a fortune, buy used! You can find some great deals at thrift stores. You can find lots of popular brands at the thrift store. I come across Nike products every time I'm there (but I don't like Nike). If you are brand flexible there is a good chance you will find some good running gear, too!