Not that I've seen. You might see if there is a local cell repair shop, they might sell one too you. Otherwise you can get from Amazon in a couple of days.
I just bought a kit here http://www.ifixit.com/iPhone-Parts/iPhone-4-Liberation-Kit/IF182-019-1 since I found that the torx screwdriver people were recommended would no longer work since Apple switched to the pentalobe screw Mid-Year. Getting mine today so I can swap out the broken back cover.