Heartlandvapes has hands down the best prices. For what most vendors sell a small sample of flavoring, with Heartlandvapes you get a four ounce bottle. There nic is very inexpensive and extremely high in quality. My diy cost for 30 ml is well under 2$- all the other vendors mentioned here do not even come close. Compare 50 cents a ml from them to 5-10 cents from heartland vapes, you get about ten times as much. There smallest size is 4 ounces for flavoring, but for a couple bucks more I'd rather get a huge bottle than a sample