Re: Very Old Fitzgerald, 100 proof, 8 yrs Bottled 1959
It is worth about $300 -- both on eBay or privately (trust me, I've owned several similar) -- to a motivated buyer (one who's never had one and really wants one, or one who's had one and really wants another). Personally, I'm at about half that, because I've owned/enjoyed several.
You cannot legally sell it without a liquor retailer's license -- unless you have an account at Christie's or Zachy's -- but eBay seems to assume a 'collectibles' dispensation without portfolio from the BAFT, so that's about your only option.
(And, yeah, I'm one of those StraightBourbon.com guys.)