Let’s clarify terms a bit so we’re all on the same page.
If you are attempting to sell your work to a “retailer” that would be store down on the corner where you buy furniture; being the manufacturer, y0ur profit margin would be the greatest.
If you are attempting to sell your work to a “Distributor/Wholesaler” then you are the Manufacturer; your profit margin would be, roughly speaking, about 15-20% of the retail price, to allow the “retail” store owner to make his profit.
If you are attempting to sell your work to a “Manufacturer” that is a completely different story; you’re a designer looking for work.