A while back i was helping a friend build a go kart, and we needed some parts, so we headed to bent bike, while they don't sell a lot lot of new stuff they do have some, and we got a lot of nuts and bolts we needed for the go-kart as well.. While the staff usually looks like a hells angel or some other biker member, they are pretty nice and ended up letting us take the few bolts we needed for free as there wasn't much profit to be had in them i guess.. they carry alot parts for mostly motorcycles, but when you need that odd part for a lawn mower or a go-kart in our situation, its a great place to try! Mostly geared toward people with motorcycles though.
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