I've had luck with Craigslist in Vancouver, maybe not for everyone, but for me it has been pretty good, just saw these on there:
Whatever you do, stay away from Dunlop RV-XT tires. I bought some new, and I do not know how they got the severe snowflake symbol, but I almost didn't make it out of Nelson last year when it snowed. They are the worst of both worlds; they wear fast like a snow tire, and grip like a racing slick
(except it's not that funny when you are sliding backwards down a hill towards Baker street!)
I agree the technology sure has changed with rubber compounds.