Yes you can in fact buy an iPhone on eBay. You can get one for a certain provider or even a unlocked one. Maybe at a cheaper price as well.
Ebay
The best place to buy iPhone accessories is either EBay or amazon.com EBay is typically cheaper but the items of are lower quality, while Amazon is of higher quality but more expensive.
Buy it from Ebay.
Try eBay!
Look on Ebay or Amazon
yes. eBay.
The best place to buy accessories for the IPhone is AT&T because they sell the IPhone there. You can find them a lot cheaper on EBay, but they may be not from Apple.
YOU CAN'T buy an iPhone 4 because THEY DON'T exist.
There are some sellers that can be trusted on eBay to buy an iPhone from. You will need to check the sellers reviews to be sure they are legit. If the seller has bad reviews, do not purchase from them.
Yes it will come. But buy it from genuine buyers.
eBay or buy a regular one and do it yourself.
From apple.com, At&t stores, best buy stores, and eBay.