I've only purchased nic, PG and VG from 3 different suppliers.
Wizard Labs is always the cheapest.
DIY E-Cig Supplies & E-Cigarette Liquid | Make Your Own E-Liquid | RTS Vapes is about 50% more expensive and
www.ecigexpress.com is 50%-100% more expensive.
I always use Wizard Labs for several reasons:
1. They are the cheapest I've found
2. The product is always as expected. The 100mg nic juice is crystal clear and tasty when diluted to a vapable mg/ml. (I've tested the nic level)
3. The service, speed of shipping and packaging is absolutely phenomenal !
I just think it's better to pay a bit more and get a product you can trust to be 100% what it is supposed to be. Give them a call and ask about shipping to Canada and the best way to handle it.