Atari cartridges

Inspired by the discussions on this list I decided today to visit the various thrift shops in town to see if there was anything worth salvaging. I knew of eight shops before starting out, two turned out to have closed and one was too far away from downtown to be worth bothering with. As for the rest, there was not much to be found. Apart from three old monitors (one with a built-in Hercules card, according to a hand-written label) and an Amstrad PC keyboard, I found nothing of interest. However, I happened to walk past an electronic repair shop and since they had some old TV sets on display, I thought I could just as well go in and ask if they had any old computer stuff. And what do you know: in the window beside the door were six old Atari 400/800 game cartridges, with boxes and everything, seemingly in very good condition and probably never opened. (They had their original price tags of SEK 625.) I remember seeing Pac-Man, Missile Command and Qix. There was also one cartridge for some other system of which I have never heard before. Unfortunately I don't remember which one, but the title of the game was Chinese Logic. Now, are these worth anything and is anyone interested in them? I asked about them and it seems like they would be happy to sell them very cheap. /F