possible bug in products created when testing sales

[pulkitsinghal]

As mentioned in #22 (diff)

It seems that the following line might be using the wrong attribute/field:

randomProduct.price = String(Number(randomProduct['supply_price']) + 10.00);

should it be using retail_price instead?

@tinker20 - since you wrote these tests, deferring this to you
cc @kamal0808