Well, the cheapest Civic for sale is a '07 one for €5k, in fact, most of them are '07 to '11, for €5k and up. Theres a single '05 one for sale for €7k.
A '01 Prius is a couple years older, so probably a little more depreciated. The gen 2 Prius'es ('05 to '09) are more expensive, like €5k and up, so pretty much comparable to the Civics here in both age and price.
