I bought a sub of a guy on ebay and he was a VW nut. He had a very nice Coraddo on the drive and he bought it on ebay for ?1300 (N reg - i think), the supercharger was not working. It was a very minor problem and he fixed it. Car is worth ?3000 all day long (FSH, 85,000miles, VGC etc).
So there are bargins if you hunt them out and know what to look for.