Several people have inquired about Canada's GST refund policy for visitors. Aside from information contained in the event pages of the Warpstock site, here is some (hopefully) helpful stuff, straight from the Canada Revenue Agency.
Who May Apply?
You can apply for a GST/HST refund if all of the following conditions apply to you:
With one application you can apply for a refund of the GST/HST for multiple visits to Canada. To do so, on the Application for Visitor Tax Refund (Form GST176) where it says "Date of Arrival", please enter the date of arrival of your first visit. Where it says "Date of Departure", enter the date of departure of your last visit. On a separate piece of paper, please state the following: "There are several visits on this claim" and list the arrival and departure dates for each visit. By doing so, it will be apparent that this is not an extended visit.
If you have not bought enough eligible
goods and eligible
short-term accommodation to meet the $200 CAN minimum requirement,
you can ask to have your eligible
goods receipts stamped for Proof
of Export so that you can use them on a future claim, as long as
you make the claim within one year
after the date the eligible
goods were exported or tax on the eligible
short-term accommodation became payable.