Closest show to you would be gatineau at the end of august, look up for A.M.R.O. On FB or Google... There's also the cap-con show in the fall, it's an IPMS style show....
Next one on the schedule is in Drummondville in April, all a infos are here but in french:
http://www.plastikoholik.com/f44-drummondville
You could also find infos on other shows in there....
There's a couple great place in Montreal for models, Udisco is one of them. It's a wearhouse full of models of every kind.... Hobby Junction in Dorval is another one. Ted's hobby is not very far from it too.... Then there is jack hobby in laval... Those are the most well known one's....
Hope it help, Rene