Yeah, I know the feeling. My wife and I both Vape, and started the same day, so I don't have the same issues exactly. Since I buy all of her gear as well, and I'm careful to keep it fair, one APV and topper for her, for every two APV's and toppers for me (I'm a giver and was a heavier smoker), that has worked for several months now.
My reasoning is that as long as I don't deficit spend, then we're saving lives, and we already had a smoking budget, now a vaping budget. I made the mistake of thinking I was going to save all this money, at first, and it has not worked out that way. Getting setup in any "hobby" is actually quite expensive....and vaping is no exception. You know it's always the expectations that get us, isn't it? I used to use analogs to the tune of several hundred dollars per month, and figured if I DIY, I could get that cost down to about $7.00 per week. And that was true, after I got setup. I had no idea that setup costs would be so high. Why? Because there's a fairly expensive learning curve involved here. Look, it takes what it takes, and we measure success by how many analogs we don't use, not how high our startup costs are. My recommendation is don't be so quick to "recover" those smoking dollars before you get setup. Take three or six months to figure out what you like, need, want, etc., then, start thinking about saving that old analog budget....YMMV. I say, happy shopping, Power Up and Vape On!