I used shop specific flavors when I first started vaping. I joined an online ecig forum and was chatting with a group of folks that made their own ejuice. They shared recipes with me and helped me buy what was needed. I enjoyed the ejuices they shared and was really surprised at the little cost of making my own ejuice. I now just mix unflavored 60pg/40vg 5mg/ml ejuice for less than $3.00 for 50ml. I think I have enough of the ingredients to last me another 6+ years.
Jerry