From Canada, you would have to go to Liberty-Flights.co.uk. Another Chinese vendor that gets good
reviews is trueman-ecig.com.
In Canada, you can get a good Ego-T kit from NicFitNation. They'll let you customize your kit. You might prefer the low-resistance tank atomizers over the regular ones. You don't get much flavor from the regular tank atomizers.
I'll just mention this now, but if you go for an Ego-T, the atomizers are filled with primer. You'll want to blow into the battery connection end and blow out the primer into a paper towel. Fill the atomizer directly with 10 drops of e-liquid and wait 10 minutes for the e-liquid to soak into the wick. Then you can snap in your tank full of e-liquid into the atomizer (make sure it snaps in all the way) and vape away.
Also, note that the Ego-T system is somewhat prone to leaking. You can still get blank cartomizers for your Ego-T batteries if you decide you don't like tanks.
Good luck with your decision.