I've noticed that Chrono Trigger sells for a lot of money on Ebay and several of the listings claim that the game is very rare. Sometimes up to $40 for the cartridge alone. However, I recently saw a rarity guide on Super Nintendo games that rates Chrono Trigger as a D rating for rarity.

http://www.invertedweb.com/community/article.php?a=371

The list was compiled using auction sites to discover how often a game is actually listed. I've talked about this on IGN and some other message boards. Some users actually say it's not rare at all. They actually produced 2 million copies in the US. The amount of people listed on Gamespot that actually own the game is pretty high as well.

quote Dark Samurai

I've only seen ir for sell in my area twice in the last 7 or 8 years in my area. I was lucky enough to buy it the first time I saw it

I've seen a few copies. They had some at Blockbuster video but they're gone. My local flea market had one today for $50. Ebay has about 40 carts right now and almost always has that many every single week. It's a high demand game. Probably the moment they put it on the shelf someone will pick it up.