Hey Fellas - Here is a great source for blower belts http://shop.polybelt.com/H-1-2-Pitch-Rubber-Belts_c36.htm I just got my 2" wide half pitch belt for 32 bucks. Part number length times 10- H200 so a 58" long, 2" half pitch belt 580H200 etc etc They've also got all sorts of others including 8mm and "V" belts if you are uber cool.
Dang Jim! Maybe call them. I ordered my belts on Saturday and had them Tuesday. Quality stuff. Have to warn you though - they have "polybelt.com" in white stamped on the outside of them instead of "Bando Synchronous" Other than that - exactly the same. There are other places that sell industrial timing drive belts and such around with similar prices if you hunt around a little bit. Same belts the race shops have.
Although I seem to go thru pulleys faster than I go thru belts...but the last set, I had anodized, and they're showing no wear yet, although it's worn through the anodizing on the edges of the teeth.