Quoted from jfre81:There was one on eBay last month. Apparently sold for $213.77. Could be worse - there's a Flight 2000 backglass linked on the page for $499.
ebay.com link » Bally Future Spa Pinball Machine Game Backglass Original Not Repro
Looks like there is no current listing, but one is bound to pop up sooner or later there, or maybe here.
I think F2K will be re-made with the new* CRP repros? I wouldn't buy anything for an arm and a leg now with CPR remaking almost everything here soon. (well lots of stuff anyway!!)