So I came across this website/store that seems to have used high performance street tires at a pretty good price. I've never tried them but the tires seem pretty legit. The shop is located in Gardena, CA. So if anyone is looking for good used tires check this out:

http://www.atlantistire.com/webcart11/index.php

you can search for a specific size by entering it with NO spaces: EX: 255 40 17