I can tell you that there are just about a dozen hair salon between Jarry and Beaubien along side Papineau. It's crazy the quantity.. On the top of my head.. on Everett, L.O.David east of papineau.. on Belanger between ch.Colomb and Papineau. next to Videotron on J-Talon still between Ch.Colomb and Papineau. and there always that hair salon within Kiko Mufflers on 9th Ave (st-michel)
Best bet.. drive around.. you'll see lots fo Dominican flags in windows all over.
New restaurant aswell on Beaubien/Papineau.. called Santo Domingo. I didn't try it yet.. I think it opened last week