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I recently bought my transponder from these guys... the website is great, shipping was fast and free, and they have alot of stuff! Mostly Car and Kart racing supplies, but they do have stuff that motorcycle people use too, like safety wire, special tools, helmet and gear dryers/deoderizers, fuel cans etc... . Pretty much stuff racers of all types can use. Their site is: http://www.pegasusautoracing.com