I just moved to Verdun and there's an awesome little store down on Wellington, between Wilibrord and 1re Avenue. It's called "Terre et Mer" and specializes in fish and reptiles. Most of the equipment is a bit overpriced, but they have a decent selection of plants and fish at decent prices and told me they can sometimes make special orders if you've got something you're really looking for. The 2 owners are also really cool guys and the employees generally seem to care and were honest enough to tell me when they didn't know something. That said, Francis (one of the owners) is super knowledgeable about plants and the co-owner (whose name I can never remember no matter how hard I try) is a reef specialist.
As for clippings, I unfortunately have none because I just finished setting my tanks up after my move, but I might have some dwarf sag looking for a new home in a month or so, depending how things go. I'll be sure to keep you folks here posted.