In a city like El Paso, Ebay is a godsend for parts/accessories/clothing. El Paso has very little bicycle culture, and therefore very few bike shops where a commuter can get something they really need. There's two or three sellers on Ebay that I have grown to trust through the years, and they (along with an occasional Nashbar/Performance purchase) keep me on the road - tires, panniers, clothing, tubes, lighting, almost everything. When I lived in Denver, which has a great bike shop every 500 feet or so, it was different.