Personally I prefer to travel with my own stash in order for the reason that I don’t really budget time in my trips for extra work. I go for a really short time for a specific purpose. However, I’ve been into a vape shop or 2 in the mall as i was passing by and they all pretty much have the same...
Dubai has an abundance of vape shops. You could literally walk around in the mall and walk into one. As for fake juices, Dubai has very strict regulations on that.