Do the arithmetic and you will find that if there are any savings when buying in the States, they will be minimal and you will have a proper Canadian warrantee. When I bought my AE3000 I saved over $100CDN by buying in Canada.
With Quebec Acoustic, you will pay the cost of the projector, plus 5% GST (no PST unless you are in Quebec) and shipping ($15).
Order from the States and you'll have to add up all the following costs:
projector (convert to CDN$ - use the rate your credit card charges)
taxes (if delivered to a state the company does business in; convert as usual)
PST + GST on CDN$ value
If driving over to pick up, don't forget the costs with bridges/tolls ($3.25CDN each way; Johnstown Bridge), store fees ($5US UPS Store Ogdensburg), and your actual travel costs (gas and time).
If not bringing it over yourself, be prepared for excessive "brokerage" charges from companies like UPS. I would NOT ship across the border using UPS. The post office is a much better way to ship across the border, if you aren't in a hurry.