I'm trying to get my boyfriend's mother hooked up with a fairly simple e-cig setup, but I am not very familiar with the type she's looking for. She wants an iTaste VV, so I'm sure she'll go with version 3 (that's the most recent, right?), because she saw her friend with one and I'm not very good at changing her mind so we'll just go with that. But what tank would you recommend for this device, with low cost and availability of replacement coils in mind? I was thinking one of the Protanks, because that is what her friend had and she liked it, but I'm not sure which version is best, or how easily/cheaply the coils for each one can be purchased... Where do you go for the best prices on these items, and are there issues with any of them going out of stock often? She doesn't have very much money, but she's ready to quit cigarettes if I can get her set up without much hassle on her end. Help?