I went through this with HP in Canada a couple of weeks ago. This TV will be distributed through Best Buy as you have found out.
The HP guy I was talking with suggested I check with Best Buy and use the product number L1737A as well as md6580n.
I know the Best Buy stores can see the products in the pipline even if they are not in the stores. The stores seem to get what's called sku numbers or tracking numbers a good two or three weeks before the items are actually available.
We may find that as soon as the US Best Buy stores start getting this machine, then they'll start showing up here. The Samsung 6168 showed up at Best Buy a few weeks after appearing in the US Best Buy.
I wouldn't consider having one shipped to Canada. It is very unlikely the warranty will cross the border with the TV. It might, but you'd better make sure.