iPhone 4 users can download a new app to order a free case of their choice. The app is available for just $29.99.
Searching 'iPhone 4 Case Program' it was the first result for me on my iPhone.
search for
iPhone 4 Case Program
one result
I hadn't noticed the Country was set to USA, were you able to change it manually?
Think I'm going to go for this one
http://artoftheiphone.com/2010/07/21/case-review-griffin-reveal-etch/
I went with the Incase Clear.