Very seldom do you find them, better options offshore, found them but if I remember correctly it was only during the playoffs. Used to bet it at a Coast Sportsbook(ie. Renata's)
Only places in LV that book CFL are Palms, IP, Harrahs, and Stardust. Coast puts up lines the day of the game. Not sure about moneylines, but I would try the Dust and IP.