If mass production, I would say max 8 - 10$, or less related to what kind of stylecomplexity.
If it's not already a special offer, a sort of quantity or 'pack' discount should be provided.
As example in steps at 5 styles if buy in a single order. The more styles in one single buy,
the more discount.
If we're talking about unike quality styles made specially for a single customer, then I would
accept a higher price level, because producer / seller then will not gain several sales for the
same style. (At least not in the public market)