I just put in an order for SNES games at JJGames.com. I spent a whole day at work pouring through Amazon.ca looking for SNES/Gen/TG16 games, and Amazon recommended that site after a failed search for Bonk. I've yet to receive my order from them, so I can't vouch for anything beyond that their prices are better than Amazon.ca sellers. I ended up spending $150 for 9 of the SNES's very best games and a GameBoy Player.
I snagged a copy of Link to the Past for under $20, and in Toronto game shops, I'm used to seeing that for $50+.