i do not collect any sales tax, but if you are in canada, when i send the T42 you select to canada you might be liable for canadian VAT..
this is the canadian version of our sales tax..
More info on importing:
If you import anything from the US into Canada, you'll have to pay 7% GST (Goods and services taxes) guaranteed. This is federal; you can't escape it. Some provinces also require you to pay PST (Provincial sales tax), including BC - I think it's 7.5 or 8% now. So, if you import to BC you'll need to add on an additional 14.5-15% tax. I seem to remember something about being able to import a notebook computer for a business and getting a refund on your PST, but don't hold me to it.
Also, you need to be careful about how you ship the notebook into the country. USPS Global Express seems to be the best option because it a) doesn't cost too much, and b) you can get the notebook insured for up to $6000 CAD, I believe. Might be USD. In other words, if you can import the notebook into Alberta instead of BC you'll save a huge whack of tax - AT LEAST $175 USD.
DO NOT USE UPS STANDARD! They will charge you a huge brokerage fee (4-5% of the purchase price, IIRC), GST, PST and a handling fee as well. If you are going to use UPS, use UPS Express or Expedited - the fee is included with the purchase.
I have no experience with FedEx other than a book here and there, which is not applicable to the situation. Anyway, good luck with the notebook!