They are very expensive and there doesn't seem to be a lot of point in them. I am sure that you could do a personal import from the USA but the cost, including a supply of consumables, would exceed £400.
The cheapest pair is US $258. Add consumables for one year ($60) and shipping (at least $50) the total comes to about $368. That is about £306. Add VAT of 20%, making the total £368. You then need to find an Optician who will prescribe/dispense and fit lenses.
And on top of the amounts stated by HuwieHex you may have to pay import taxes. I am not sure but I have heard where some people have had to pay excessive taxes when having items delivered from certain countries so please be really careful. I know it states "Free Shipping" but that will not mean you don't have to pay taxes. Xx
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