They go for $50-$100 on Ebay. They are great cams and yes they take great pictures.

http://www.flickr.com/photos/rawhead/3481109275/

There may be several versions with different optics; mine is a Schneider Kreuznach Retina-Xenon 50mm f2 with a red delta mark, making it one of the best optics that the Retina series ever had, I believe.

http://www.flickr.com/photos/rawhead/3378352074/