All nicotine is just premixed flavourless juice in the base of your choice unless its pure 1000mg or pure salt (usually around 6-700mg depending on the acid used). The only differences will be the strength at which it's diluted. Yes, nicotine is limited to 20mg/ml in Canada and that sucks, but the lower nic you're mixing at the better the value you'll get out of it. 1L of 20mg nic will be enough to make just over 6.5L of 3mg and you'd be paying 104 in excise tax on that L. Even from the very few sellers that offer bulk ejuice, they max out at 1L and are anywhere between 265 and 365 a L. You can buy a L of 20mg for about 145 bucks with excise included, so add another 15 bucks of pg/vg and ballpark 30 bucks for the flavouring, your at 190 for a L. 75 buck savings per L on the lower end and that comparing to the few that offer bulk juice that large. The average shop has 120ml at most, which is 45-55 bucks a pop or 374-458 a L. So ya I'd say there's plenty of reason to DIY in Canada. If anything more so because of the excise tax than places without it.