Ebay, biketiresdirect, downtube.com, everywhere google has taken me, Probikekit, etc. On Probikekit I saw the Vittoria Cross Evo XN tires, which also have a diamond pattern, and am now considering those as well. Tomorrow I'll head to the LBS to see what price the Tufo's are there and if they can even order them. I was looking to save some money though, so wanted to find some online.