No products in the cart.
2 ways you can do this:
When adding purchases simply make purchase price 0 for the free items.
Find the average price of the item and use that for unit price.
for example, if you purchase 10 quantities for a price of 2 each, 10X2 = 20and get 2 quantities free, then the average cost of each will become 20/12 = 1.66
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