Too bad about Oberon Design; they make great cases and binders.
Still, look around; there's dozens of DX cases like this:
http://www.amazon.com/gp/product/886...ASY5NBE6PPAM9M
Note the elastic in all four corners.
Failing that, could can always get a journal or pad binder and velcro the reader in place.
Or just wait after the 902 ships and somebody starts making covers for them.