I've ordered four lights, 2 from cfrlights and 2 from elektrolumens and have never had to pay a dime for GST, HST, customs, duty, excise, or whatever. I think if your order is under some magic number, say $50 or so, they can't be bothered.... It costs more to collect than they get from you.
[edit]BTW, each of the orders came via Canada Post. If it comes via UPS or Fedex, etc., YMMV.