I dropped my iPhone 4 for the first time since I purchased it last September and the back finally shattered. Fortunately, the camera wasn’t broken and it didn’t look as bad as some shattered iPhones I’ve seen.

I decided to browse the web for some replacement parts and I came upon http://sw-box.com. I was skeptical at first since I’ve never purchased wholesale parts, but since the prices were reasonable (~$16 OEM for the back plate) I bought two, black and white. I also purchased a new battery since my battery life has been very poor. 

iPhone 4 back / white / $16 - item link
iPhone 4 back / black / $15 - item link
iPhone 4 battery / $7 - item link

Full list of iPhone 4 parts 
How to remove back of iPhone 4 (fairly simple)

Photos

Final Thoughts
I spent a total of $48 on everything. The package came from Hong Kong in less than two weeks and was packaged securely. The back plates for the iPhone 4 were brand new and the battery was definitely new (after testing). I would buy again.