A friend of mine recently bought a bed for a 3 yr old from littlewoods, said it was the cheapest place they could find and they delivered. I've never bought from them but I'm guessing the downside would be you couldn't view it first. How about IKEA?
When I was looking for a single bed for my little one, I almost bought one from Littlewoods but the hassle of registering put me off. Instead I got one I liked better, much cheaper, in a local furniture shop.
It turns out that internet shopping isn't always the best option.