I investigated buying a Delorean from Canada once so I know a few things about the subject.

You can buy a car in Canada and register it in the US if it is an exact copy of the model sold in the US as far as safety and emissions goes.

There are times at which buying cars in Canada is temporarily prohibited, such as when the US economy is in the shitter.

That's all I remember, but it is doable.
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-Rob Riccardelli
80GB 16MB MK2 090000736