I got mine on Amazon for $35 and see that it now went up to $41.99. Just keep an eye out for a sale (I keep them all in my cart so it alerts to price changes). Not sure what shipping would be to the UK, but worth checking.
I'm assuming you mean this? http://www.ebay.co.uk/itm/MICROSOFT...780?pt=LH_DefaultDomain_3&hash=item3cf8d89ee4
Whilst a lot of the warnings/caveats do seem suspicious, the final photos look like maybe these were bulk sales for educational or institutional use?
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I brought from this seller and the pen looks genuine to me. Works 100% no issues. I did do a search online about fake Surface 3 pens and didn't find any reports of any, so I thought this would be a safe get try this. Got tracking number and everything, took only a week posting to the UK.