Once you get going, you will probably find ways to save more money, if that is still an issue. For example, I go through a lot of juice, and it was expensive buying it premade (and not really all that great, either). I can't say I've improved the taste, but I make my own juice now, and it is so much cheaper, I don't even think about it. I'd estimate I'm spendng $30 (or less) a month on vaping now, including attys. I got a good system (a reo mod) that will last and last and last- and the next time I buy a nicotine solution, I'll buy just as good or better quality than I did the first time for a lot less money, just because I've become aware of more vendors. I should be down to $20/month after that!
So go into this with confidence. You really can't make a serious mistake. As long as you vape some, you'll be saving money and health as time goes on : )