I have been purchasing these specific vapes from a nearby store of mine at a large loss, they charged way over standard pricing for these, and sometimes we would get one and it was a dud or had a much shorter life, so we decided to switch to purchasing them directly from the source. The first two we opened from the 10-pack put the ones from the store to shame, they were so fresh and so flavorful, but since opening 3 others, they seem to also be duds and taste half-potent, so 2 of out the 5 we have opened are good, but the others taste bad. Buying 10 at 10 a piece though seems to be much cheaper, it still is a gamble because we don't know if the ones we buy will work properly or not.