stealthhydroponics.com ships to canada. I bought their $100 6 plant bubbleponics system a few years back for my first grow ever and had a great experience with it.
they also have a DWC for around 40 bucks if i remember right. Seems like a very legitimate company IMO
If you are in the Toronto area, Check out Toronto Hemp Company, downtown on Yonge st., or Yield of Dreams in Newmarket, both are good shops with knowledgeable staff.