Hope this isn't a re-post, couldn't see it posted elsewhere (other than the sun deal which apparently doesn't work).
Found this deal - £10 each way Dover - Calais. (I have seen a couple of crossings for £6, but can't remember or quote dates/times). I've booked for 07/11/08 and it cost me £20 return (would have been £22 if I booked with credit card).
Got to be the one for a cheap booze and fags stock-up for Christmas, despite the crappy pound vs euro exchange ratehttp://www.poferries.com/tourist/content/pages/template/offers_ferry_offers_last-minute_special_offers.htm