They are very hard to find, esp the street tires (universals). The knobbys are also tough to find, esp. if you want NOS. I saw a set of knobbys on ebay a few days back for $150 for 2 tires. You're best bet is to see if anyone on here has some extra's they want to sell. Most likely used. I have some, but I am keeping them for my bikes. Keep searching ebay/google or on here...Good Luck! I'm sure someone will have some used ones if you keep looking.