J2Store allows you to try all kinds of pricing options on your store. Lets say you have different quantity ranges for a particular product. You can set different pricings for each quantity range. For eg if you have quantity ranges 1-10 items priced at $50 and another range 10- 20 priced at $55. If a customer decides to buy 12 items of the same product, this is how he will be charged. (10x $50) + (2x $55). Learn how to implement this on your store.