Hope this helps: (don't mean to offend any that I have missed; this is from memory and recent purchases.)
If you follow the links you'll have access to major stores in Canada. It won't help you price match for OpTech, but it will for major photo gear.
There is a comment on import charges too.
Some photo vendors, from memory
Western Canada? The Camera Store is in Calgary, I believe.
Eastern Canada? Henry's, Vistek, Aden.
SW Ontario? Stan C. Reade in London. Forest City Image Centre in London; Wish Linden Photo was still in business. Good people there!
I ordered directly from the OpTech site when I needed fittings; parts were inexpensive, shipping cost was reasonable. They even have discontinued bargains!
Finally, Helen Oster has helped me so much. Adorama has a heart! Shipping costs were a concern for me, and she found a way. Not free, but very helpful. I positively had to resolve the dreaded UPS broker charge. Surely they've found a way too.
B&H used to have a link for reasonable Canadian shipping; however, I haven't bought from them recently. Perhaps the gentleman who posts here can help with an explanation. Sorry, no link.