I was going to suggest people could possibly buy these at bulk discount and resell them for a profit. The original boxes really help a lot in re-sale. Are they essentially new old stock?
With a deep enough discount that might be OK but the numbers aren't that great if you have to pay import to get them to the UK or (maybe) Aus
He's selling at $225 at present for one. Let's say he accepts $200 - with postage and import duties (added by ebay so I assume he's using the Global Shipping Programme) and the poor UKP exchange rates that will be about £240.
You can buy one new, with warranty, from RS or Farnell for £476.40 which limits your ebay resale price - lets say you can make £380 so that's £140 "profit" - less about £60 ebay+paypal fees, less a tenner to post it out so maybe £70 gross. You have to take the hit on any returns at that and if it were me the Government would want £28 in income tax (yes, I do declare my ebay sales).
Oh, and you need to either buy up the whole stock or wait until he has sold all of his because if you look at recently completed sales it's clear non-one
else is managing to sell any U1252B's on ebay at the moment.
I'm not saying I wouldn't do it but I'd need to be thinking of at least 30-40 units for it to be worthwhile.