My Featherweight (221k) was in an antique shop labelled at £85. Mr Acorn paid less than that for it (my Christmas present just over a year ago), but I don't know how much less. It's in pretty good condition (wiring needed slight attention, and case smells musty, but otherwise excellent).
I know 222ks are dearer and more desireable, but that is absurd. Something definitely looks fishy.