If you have not visited www.ebay.com recently you will have not seen the changes to there search facility which makes it even eaiser for you to find the perfect new car!
Prices on car vary greatly depending on which car your looking for, you need to be very wary of cars at very low prices with good descriptions where the seller says 'good condition', this may be these cases the car may be in good visual condition but the internals and mechanincals of the car could be in very poor condition which could make driving the car very dangrouse.
there is also the issue of some cars that could have been stolen and sold on by the criminal, i suggest that you should always ask the seller before you bid or buy for the car's full specification and its registration number so that you can check with the DVLA's data base either online or through text both of wich cost a small sum but its worth it!
All i can say is that you defintly look at ebay for cars but you should be very careful and always check the registration plat!

