Amazon - Online shopping from the earth's biggest selection of books, magazines, music, DVDs, videos, electronics, computers, software, apparel & accessories, shoes, jewelry, tools & hardware, housewares, furniture, sporting goods, beauty & much more
eBay - Buy and sell electronics, cars, fashion apparel, collectibles, sporting goods, digital cameras, baby items, coupons, and everything else on eBay, the world's online marketplace
eBid - eBid. The worlds online auction marketplace.
Best Buy - Where technology meets a simpler, more convenient way to shop Best Buy.
WebStore - Open a free webstore today. No membership/signup fees, no selling fees, no bidding fees.
Swappa - Swappa is, in fact, an e-commerce website working as a platform for dealing with used smartphones, tablets, and mobile phones related accessories as well.