Southampton Ikea have these at £9 down from £39 - however the assistant said they are clearance now so this should be nationwide.
As with most things Ikea, you buy the frame and choose the mattress type seperately - the cheapest one being £60...so £69 for a sofa size futon is not bad!
Note that the Armchair size futon in still £29.
Southampton had 209 frames in stock as of yesterday (208 now ;)) BUT they were out of the cheapest mattress. They are due in this week, however.
Adjustable back allows you to sit, relax and lie down.
Mattress and cover sold separately; choose a combination that suits you best.
Untreated - can be stained, lacquered, waxed or oil-treated.
Sofa, chaise longue and double bed in one."