Just curious if anyone who uses flavorwest for DIY buys from them direct? Is it more cost efficient buying from them in 4oz. bottles instead of getting the flavors from another vendor in 30ml bottles? Last wonderring how long the 4oz. bottle goes versus using a 30ml.I know the 4oz is a larger size and will go farther but in the long run do the larger bottles have to be used up quicker before they would spoil,or would they spoil at all.I am getting ready to make my next purchase of flavors and can't decide if i should go with the larger,or stay with the 30ml flavor bottles.Only downside to this for me is going direct from flavorwest they only carry a few tobacco flavors fortunately they have a couple i do use.