In my experience, they take advantage of those new to vaping, and sell merch to customers that they can't use unless they upgrade to a bigger battery, and say that it will work just fine with the battery I had in my hand!! I asked the guy about a possible exchange BECAUSE one of their employees sold me a piece I am unable to use, he shrugged his shoulders with a smirk on his face! Prices seem to fluctuate from day to day and customer to customer.. What a disappointment! Unfortunate that this business feels they need to be snakes in the grass to make money. If you go into this shop, be sure you have full knowledge of vape products!! I, most certainly, will not be back... I spent over $100 and ended up with a $15 tank and a few over priced wicks. Lesson learned!!