Any of them are OK; I prefer "Sales price" or "Final Sales Price"
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Something may be offered or put up for sale. Someone may be selling something. I would suggest 'sale price' or 'selling price' are equivalent in this context. But 'sale price' may have the additional meaning of a discounted price (though this meaning may be more obvious to North Americans).
As for 'sales price', since this is the price of (the item for) sale - that is, the price belongin