I have a Gator GK-276R ATA hard-plastic case for sale! It has been used just a few times to protect my keyboard, otherwise it sat in the closet.
The case is in very good condition. New retail price is $299, Ebay $190 - $249.
At $120 + shipping this case is a steal!
It will fit many keyboards including :Yamaha Motif es7 + XS7, Hammond XK1,2,3 ; Korg M3-73 key, Kurzweil, Roland VK, VA76, G70, Fantom ; Korg Stage pianos ..............and many others.
Here is a link to crossreference the case by keyboard model : http://gatorcases.com/subpage.asp?navid=4&id=27
The inside dimensions are:
Interior Length 51.25"
Interior Width 18"
Interior Height 6"
Exterior 54.25" x 19" x 7"
Weight 27.63 lbs