Some time after I was diagnosed with COPD, I was watching the movie "The Tourist" with Jolie and Depp and saw Depp vaping. My wife had told me that she had seen a cast member of TV's "The Real Housewives..." vaping as well. So I made a mental note to get educated on this new nicotine delivery system. I read up on it and read many of the posts here before deciding to give it a shot. I decided early on that this was not going to be a hobby and that if I was going to do it, my wife should too. She agreed.
I started looking at web sites and settled on Smokestik (no special reason). We bought a starter kit and began the adventure. It took me about two weeks to quit analogs altogether even though I had been smoking them for about 50 years. If memory serves me, my wife took a little longer; about six weeks. That was late 2011.
Today, we still order pre-fills from Smokestik and still use the same cig-a-like RN-4081 batteries. I have stopped using the pre-filled cartomizers even though that's all my wife will vape. Although I order them for her, this gave me an idea. If I could find an economical e-liquid, I could refill the cartomizers my wife emptied and vape them for a fraction of the cost of pre-fills.
I experimented with a few brands and settled on "e-health" liquid (16-18mg nicotine) costing almost $7 (USD) for a 100ml bottle, or 6 cents per ml. I go through roughly three cartomizers a day, so if each cartomizer holds 1ml, my liquid cost is about 18 cents a day.
Battery costs have to be amortized from their original cost of roughly $6 (USD). I get them in multi-packs of 5 to keep the cost down. A typical battery will last me a year and cost me roughly 2 cents a day. I'll usually go through 4 batteries a day, bringing the total battery cost to 8 cents/day.
My total vaping cost is conservatively estimated at 24-or-so cents a day.
Of course, these economies are mine and mine alone. Having to purchase pre-fills for my wife adds considerable cost, but since I repeatedly recycle her spent cartomizers, the total costs will drop considerably over time. BTW, I now have well over 1,000 used cartomizers at my disposal - more than I'll ever use in my lifetime.
Almost three-and-a-half years later, we are both still vaping and tobacco-free ... and THAT was the point of it all.