Have you looked on Ebay or Amazon?
I'm gonna start looking for an actual hard case to carry mine in. I've been sliding it the laptop compartment of my backpack but I'm worried the screen is gonna get cracked. Matter of fact, I'm gonna go look at Ebay and Amazon right now.
If I see anything like what you're looking for I'll post you a link.
Samsung Galaxy Prevail
TF300T Asus Transformer 32GB w/ dock
Samsung Galaxy S3
IS THERE A REASON YOU'RE NOT ROOTED YET?