Probably in the $200-$250 range. I switch cases all the time. Funny, the one I like most was the least expensive - The Case-Mate Barely There.
Thats redicoulous, you spend a round $200 bucks on Cases then when one fails you spend $200 to replace your cracked phone. Why not just save $200 and just use your iPhone naked beat the **** out of it, scratch it up and then just pay the $200 to get a new one later on ??