Check out VP Pro Tires. Very high quality racing tires, at great prices!
www.vp-pro-usa.com
I use the VP Pro Turbo Trax in Ultra Flexx Compound at my local track. I also ALWAYS carry the following on me.
VP Pro Strikers in Ultra and medium Flexx compounds
VP Pro Cutoffs in Ultra and Medium Flexx compunds.
Hope this helps!