I started making my own e-liquid around a week ago and it has gone great so far. I thought I would share a few good online stores to get DIY e-liquid materials from.
Liquid Barn is the best place in my opinion to buy VG, PG, and nicotine. When I placed my order shipping was rather slow, but when my order came the items were great quality. I would personally place a second order because of there great prices and quality product.
Ecigexpress is another great site for flavorings. Although I am not certain these are some of the best prices, my order arrived rather quickly and their selection of flavorings is very large.
GremlinDIY is my second go to for flavorings. I usually order from this shop when ecigexpress doesn't have a certain flavoring I am looking for. Shipping and quality are the same on both websites, though I do notice that GremlinDIY is cheaper then ecigexpress.