Right now on Groupon you can get a $45 voucher to CustomCase.com for just $20. Most custom cases on the custom case website costs from $39 to $44.76. So you can use this voucher to pick up your own personalized case. You can get a monogrammed case, or personalize it with your favorite picture or checkout the many personalized designer case options. This is available for iPhones 4,4S and 5.
