I bought one from Island Cases on a well-known online auction site. (
http://www.ebay.com/itm/ATA-GLIDER-Case-RECESSED-WURLITZER-ELECTRIC-PIANO-/230670527845).
Used to be 150, but 180 isn't too bad if your piano is worth $1000 or more.
Nice thing about it is the lower half is just a shallow tray, so if you don't care about setting up a sustain pedal (or don't have one), you can just set the road case up on a keyboard stand, remove the lid, and you're ready to go!
The piano sits on some foam pads and I keep a right angle cord in the aux out. Have gigged and toured the crap out of this case, it is pretty sturdy and light. Not flight-worthy, but it is doing the job just fine.
Also, I ditched the cheap wheels and webbing, I think rolling the thing on pavement is asking for vibration and shock-induced trouble inside the piano. I added a couple of inexpensive amp-style strap handles to one of the long sides and it works great.