I found mine on eBay about a year ago...1951 Centennial edition, great condition with case, manual, accessories...only $225 w/free shipping. It was a Buy It Now, freshly listed. I know, it was a STEAL!
Later, I bought a ruled face plate and extra bobbins. Warning: the bobbins I bought on eBay are cheap and don't work! I would suggest getting them from Sewclassic.