I was in IKEA Glasgow yesterday (by the way, it was very busy, but the checkouts were full of staff so the average wait at a queue was much shorter than a weeknight) and saw this great bed on offer for a crazy price. The regular double frame has been reduced to around £85 and the king-size is just over £100. I saw it being available in brown, definitely real wood too for a change!
I'm guessing the price includes the slats and the midbeam, in which case the actual cost for the frame will be about £30, pretty good if you already have the slats and midbeam for a super-king bed (200x180cm, roughly 7x6 feet!)
IKEA Glasgow also have a massive sale on at the moment, which appears to not be very well advertised. It would seem this sale is better than the summer ones that IKEA usually run (as an ex-employee I can comment as to the usual direness of their sales).