You can get good value crates from Pets At Home - it'd probably work out cheaper than buying one second hand and getting it posted. We've just got one of these a few days ago and it's very good quality, has two access doors and a plastic tray in the bottom. I looked online (inc ebay) and found some slightly cheaper, but by the time postage was added they were more expensive. A lot of them have metal bottoms too, which can have sharp edges and are harded to clean (and not as comfy - the plastic tray has a bit of bounce in it).