I all I recently did the whole move house thing and I found bunch of Atari 2600 games I bought when I was young. From checking online some of these seems to be quite rare. I am not a collector myself but I am sure someone else might appreciate the following titles all games are (PAL):
Bumperbash - 9 (Extremely Rare)
Mangia - 10 (Unbelieveably rare)
China Syndrome - 5 (Rare)
The Challenge of Nexar - 4 (Scarce +)
Space Shuttle - 3 (scarce)
Football Real Sports Soccer - 4 (Scarce).
I am going to be away for the next few weeks on holidays after 1 Aug so I may not be able to reply until around the 16th but I am interested in seeing what people would pay for them as I am considering putting them on Ebay after I get back. I also have a Spectravideo Compumate (PAL) version still in box.