I have for you 2 beautiful atari 2600 games. I don't know much about this system, but I believe these 2 games are NTSC, since they are exactly the same as the NTSC scans on atariage. I tested them on a pal console though, and they worked on that. I can take more pictures if needed.
The dp guide has the xonox game rated at 50 bucks, and xenophobe rated at 25 bucks loose. Like I said, I don't know much about the atari 2600, but I assume these are good prices for a start.
Payment can be done by paypal. I live in the Netherlands, so shipping to the usa/canada/whatever other country, will cost a bit more.