eBay would be a great place to sell but have you check your location if there is a local marketplace?
Amazon and aliexpress would also good place to sell
Anyway, you can also sell your units in this section
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https://bitcointalk.org/index.php?board=75.0well I think he is in europe Macedonia is near greece and albania
He can sell to european market easier than the North American market.
He could try multiples of 5 or 10 vs 1 sale of 50 pieces.
The market place here uses escrow guys such as myself.
Mind you I am not doing an escrow offer here.
What can you get for them
https://www.ebay.co.uk/itm/144045288276?personally I would never pay 4500 pounds for one of them.
what are they worth with a btc sale maybe 2000 to 2500 pounds. they do not have clawback like an ebay sale.
they earn 9.2 pounds a day and burn 50 to 60 k-watts a day which could mean power cost is 3.2 pound so they net 6 pounds a day
2000/6= 333 days to break even
2500/6= 416 days to break even
good luck with your sale