Actually I just stumbled across another hydrofoam case at blackberryden.com called
Monaco Apex Hydro BlackBerry 8700c/g/r Case - Black
You can search for WG-3318 on their web site.
Member PixelBit has posted a query asking for comments about this case. You might want to check for replies in case anyone posts. Sounds like Monaco has had problems on some of their other cases with sleeper magnets not being positioned properly, and since this is a new case, it's hard to tell...