Newegg has about 75 listed but in a quick search I didn't find any that specifically said they would work with 12mm drives. You can search all of their listings, maybe call them and ask. If you have a frys or microcenter nearby you could go to look at them in person.
I would think if you searched ebay carefully you could find one that would fit, but it might take a lot of searching. I know that some manufacturers do make them for their own products that have higher capacity drives in them.