What Are Cheap Things On Amazon And Why Are They Cheap?

On Amazon.com I've noticed that some things are sold for very cheap (like iPhone cases) but other things like clothes and shoes seem to be full price. What are categories or things that are sold very cheap on Amazon? Why are some things cheap but others full price? Also, how can some things be sold for so cheap when they retail for way more?

You can browse the iapplefun.com, there are many exquisite and durable cases.

Well, if you need some seriously cheap case, check out this site:

http://dx.com/...d-ipod-299

if you can endure some wait time like 1-2 weeks, but it is really cheap with free shipping