A couple of weeks ago was able to buy a bunch of sealed Atari 2600 games locally in Toronto.
All of them in pretty good condition. Most seem to have Zellers price stickers on them as well. Funny, I do remember how the Activision titles were pricier in comparison to the Atari and their own in-house knock-offs. Zellers, Consumers and K-Mart were the main sources of cartridges for me in 89-91.
When I got these at home, I noticed that I had some repeats although none of them were actually sealed. This just proves to me that I need to do a better job with my inventory and do less impulse buying.