Hi Hendell,
Samsung is releasing them only thru leading service providers in Canada. The SGH-i747 variation of the GALAXY S III will be available from Bell Mobility, Virgin Mobile, SaskTel, TELUS and Rogers Wireless, and the SGH-iT999 model will be available from Videotron, Wind and Mobilicity. As of last month, they have more than 9 million carrier pre-orders to date, so I don't think these products will be available for wholesale from anywhere else.
Let us know if you need further help. Take care.