I am very cheap out of choice but also necessity. I have been using an Itaste vv3.0 for nearly two years and I was lucky enough to buy that off someone on Facebook for $12 and it had a Protank attached. It is all I have every really known and it served me very well but has finally died. I want to get into rebuildables but still use my old protanks and other non-sub ohm atomizers well. I am totally confused and overwhelmed with all the batteries out there. What battery options are good enough for using tanks such as the new Kanger Subtank and regular protanks, are not very bulky in pants pockets, and most importantly, are under $35. Any battery/rebuildable combos I can piece together under $45? Where is the best place to buy?