the only problem with shipping surefire lights to Canada is the batteries. you are not supposed to ship lithium batteries to the UPPER US. it happens all the time.
Due to all of the additional restrictions imposed on international shipping a lot of dealers will punt when it comes to shipping international. The eBay guys kinda do whatever they want. One day they'll get hit and it will be difficult to get lithium batteries except by local sale.
Not completely true. Per USPS guidelines batteries contained within devises are permitted.
http://pe.usps.gov/text/imm/immc1_014.htm#ep1059904
"Only lithium cells and batteries under
135.63 and
135.64 that are properly installed in the equipment they are intended to operate may be sent internationally or to APO, FPO, or DPO locations when not restricted or prohibited by the destination country or APO, FPO, or DPO location. For specific country restrictions, see the applicable Individual Country Listing."
From Canada Post.
https://www.tc.gc.ca/eng/tdg/lithium-batteries-are-dangerous-goods-1162.html
In Canada, the shipping and importing of lithium batteries
Footnote 1 are subject to the
Transportation of Dangerous Goods Act, 1992 and its Regulations.
Lithium batteries are used in many electronic devices like cameras, cell phones, laptop computers, medical equipment and power tools.
When you ship or import lithium batteries, including those
contained in or
packed with devices and equipment, you
must meet shipping requirements and declare package contents to postal carriers, couriers or transport companies.
footnote 1 In this document, the term
lithium batteries is used to refer to
lithium ion and
lithium metal batteries.
The Canadians appear much more concerned about counterfeit batteries than the US authorities do.
"Counterfeit and no-brand lithium batteries are also of concern, because they may not have been safety tested. These lithium batteries may be poorly designed, have little protection, or contain manufacturing flaws."