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I have had good results buying from Bikeman.com. Their prices are reasonable, they have a multitude of small repair parts and they have a USPS shipping option. On my last order, I was charged $3.17 for shipping via USPS, a far cry from the $8 minimum for shipping charged by other on-line stores I have patronized.
USPS is the best option for small/light parts. It's nice to see a retailer take advantage of that.