andy, try michael's craft store or any good hobby shop. i try to buy mine from the local hole in the wall hobby shop guy, but he rarely stocks up on pinewood derby stuff...so i have to go to michael's.
you can get pinewood kits from eBay and other online sources as well. about $6 or $8 for a full kit with a sort of formed car or about $4 for a an unformed block, 4 wheels and 2 axles.
brad.
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'68 gray 2002 pig-cheeker - '74 verona 2002 - '74 turkis 2002ti(-i) project - '97 Ford Ranger parts hauler - '06 astro black MINI Cooper