Just like Susan said, it can get expensive if you let it......I started a few weeks ago on a single ego twist battery and protank 2 for a total of $60 (high price cause I got it through a local B&M) and some juice. Fast forward a few weeks and I spent close to $200 on another Protank 2, 6 Boge F16 carto tanks, 25 cartos, and countless juice from many vendors.......the rabbit hole goes as deep as you want my friend! And welcome to the forums!!