I saw an awesome machine carrier in a recent class. I think it was a Tutto; it had the exterior pipe frame.
The cool thing about it (aside from the wheels and all the space) was that the top was reinforced so it could be used as a seat. The lady who owned it sure looked comfy sitting on her case while the rest of us stood around in the concrete hallway, waiting for class doors to be opened! Several of us asked her about it, we were all a little jealous.
I am needing a rolling case too, my plan is to measure my machine and head over to Ross to see if I can find a good cheap rolling suitcase that will work. I don't need it rugged/padded enough for air travel, just for taking to local classes.