I know I'm probably the last person on the planet to do it, but I've finally bought something off of ebay!
In my case it is a mid 90's Saab 9000, and I'm really happy with it.
Over the last few years I have had jobs which came with company cars, including a few quite flash ones. Now I don't get any perks like that and I've bought a car for less than £250, and I'm much more satisfied!
The car has a huge milage, but it's Swedish (that helps) and it's in excellent shape. I'll still be commuting to work by bus, so it's not going to have a very hard life and should have a good couple of years left in it. It's got 11 months MOT left, we've taxed it for 6 months and insured it for a year and it's cost less than £500 in total.