There's a scuba swap here in the Greater Toronto Area each spring and it seems to always be a great success, and it's also a social event and they have some presentations, like GUE Project Baseline wreck surveying, etc. I've bought regs and pressure gauges there in the past. They have bins of Jetfins and other fins for $5 - $10 a pair. There are tonnes of great deals on a wide variety of gear/accessories, but you've got to go early for the good stuff.
Thanks for the tip.