I've bought a lot from Canvape.com, they're pretty good at shipping all the way to Calgary.
I've built dual coils into my Kayfun. Get on youtube for how to do it. It's a little bit of a pain but not that hard. I find myself putting a single coil back on it though, better battery life.
If you want one designed to be a dual coil maybe have a look at the Aqua. The only thing I didn't like with this one was the tank section is stainless steel and I want to be able to see how much liquid is in the tank. I use cotton wick and get nervous about running dry and burning the wick. The Aqua does have a frosted tank section available so that you can see the juice. Didn't see it on canvape.com but they have it on jgvapes.com (another Canadian supplier I found to be really good).