I've got some prototype Pibow SD-Card protectors on sale on eBay at the moment. They've been used once for testing purposes and are in near perfect condition (no broken parts).
http://www.ebay.co.uk/itm/151130680377? ... 1555.l2649
They keep your SD-Card from being accidently knocked and also offer some protection for the Micro USB cable.
Cheers for now