The white ones are more expensive, and with a case is even more $$$. If she purrs like a kitten when you sew...buy it! The ones on ebay fetch around $250.00- $350.00 for the black ones, the white are much more. And if there's a case, it's even more.
I've been watching the ones on ebay, and they always go out of my price range!
Blessings,
MaryAnna