I bought an HP 7260 from Currys a couple of months ago for £49.99. I haven't used it much yet, although it's memory card slots came in handy when I bought my digital camera (it uses xD picture cards, and the card reader on my PC doesn't support this format!).
The 7260 is now discontinued according to the HP site, so you should be able to pick one cheaply. Bear in mind though, that it doesn't have a black No.56 cartridge included with it, just a tri-colour and a photo cartridge.