aldi are doing this at the moment.
http://uk.aldi.com/uk/html/offers/2867_5794.htm
I bought something very simlar from my local tesco store for ?19.99. The also had a 2 man for ?17.99. I'm glad I got the 3 man. the packed size wasn't much different, nor was the price. I now have plenty of room for me and the servants.