I have the iRex shoulder bag. I took the strap off, and I just put the case in my bag. It's nice looking, effective, and cheap.
I had an medge cover, but that made me realise I didn't want the iLiad always inside a folding cover. Too much fuss, too bulky.
The only thing about the iRex shoulder bag is that the hard front insert was starting to wear away the black finish on the bumps either end of the pagebar. So I just put a bit of bubblewrap in the bag...