Post mortem:
https://www.ebay.co.uk/itm/173683709938
So we had two NOS Personna floating head razors with 5 Personna 74 blades each (those are about £3 each). Starting price of $9.99 for the lot..
They went for $129.12 (£102) plus $18.54 postage plus $31.99
import charges (if the winner would have been in the UK)
That's $179.65 or £142 total. £71 per razor. If it hadn't been for the £40 to get it here it would have been an OK deal.
Still way over my budget, but about what I expected, especially with £30 worth of blades included.