It was **** in ALDI which is a budget supermarket in the uk. Original allocation was around 6 bottles per store which went on a first come first serve basis. I missed one.
It was indeed retailing at around £50.
Dont know current values but it was very limited. (not a real distillery so likely excess stock which was past its best).
Ive heard it was average quality, so any value will be based on its limited release rather than quality.
Online whisky auctions are your best bet. Or just drink it ;-) its not going to get 1000's