The daughter and I are very happy with internal battery mods. However, thanks to the FDA, I have been forced to look into other options. Since my daughter likes tube mods, I got her a Provari 2.5 starter kit as an early Christmas present last month, when her mod stopped holding a charge and only worked via the usb passthrough. She likes it. Someone in another thread posted that Provari has some models on sale for $19.99, so I got myself one, plus a backup, and a backup for my daughter. Also got a couple of chargers and some batteries, all for around $20 or so more than I paid for her starter kit.
I still have to dip my foot into DIY, which I am not too worried about - once the basics are purchased, it seems to be a matter of following a recipe. My main concern is having to build coils. My eyesight is not good. I was told several years ago that I have cataracts developing, the atmosphere here in California is usually very dry (we also have central heat and air, which does not help with dry eyes), etc. If I can get the daughter's boyfriend to commit to building coils for all of us, I will gladly find tanks that will work for my daughter and myself that he is comfortable building on. He sub-ohms, and the daughter and I are tootle puffers currently using Nautilus Minis.