Just seen this offer on Empire Directs site, might be worth a punt if you are in the market.
You get a free return flight to east coast USA (have to pay taxes) - a few date restrictions which I suppose is fair enough on these types of deals, but all in all it isn`t a bad offer. The cheapest product I could see to qualify for the offer is £269 and of course there is nothing to stop you doing the usual and flogging it on ebay.
Better choice of dates than the Daily Mail flights offer, plus you don`t have to put up with buying that nausating rag for 30 odd days.
https://www.empiredirect.co.uk/FEATURES/Sony/FreeFlights/index.asp