Refillable pod kits usually cost less per millilitre than prefilled pod kits, because a 10ml bottle of nic salt is cheaper than the same amount of liquid sealed inside a prefilled pod pack. At Wolfvapes prices in November 2026, nic salt e-liquid works out at roughly 20p to 25p per ml, while popular prefilled pod packs come to about 46p to 50p per ml. That gap is the main reason...