I had the same question as Best Buy Canada informed me that the Best Buy exclusive "Birds of Prey" steelbook would not be available at all. Messaged the US Facebook page and received no response after a few days.
Seems that there is no way to receive this in Canada through the site:
We can ship BestBuy.com orders to:
The 50 United States
U.S. Virgin Islands
Options for placing a BestBuy.com order with a non-U.S. billing address:
1. Have your order shipped to a mailing address within the 50 United States, U.S. Virgin Islands, Guam or an APO/FPO address
2. Pick up your order at any U.S. store or choose to have someone else pick up your order
Placing a BestBuy.com order
Use this exact billing address in place of your non-U.S. billing address during checkout:
10780 Kempwood Drive, Houston, TX 77043"