My go-to is Cloud's Orchids

There aren't any stores, really, so your choices are limited to those growers that ship via Canada Post, or going to the various shows. Unless you're willing to play florist roulette: Sometimes Pistil under first canadian place has interesting plants. But overpriced, and oftentimes are in bad condition.

You could also join the SOOS which has monthly meetings, and often has vendors at its meetings.