I'll take a bit of a contrarian approach to this subject. Your cost has nothing to do with the actual selling price of your knife. Sure, it's worthwhile knowing what the input costs are, both direct and indirect. You might view that cost as a "floor" or breakeven cost. But, what you charge for your product should be driven by what the market will pay, not what it cost you to make it. The "market" doesn't care what it costs you to make the knife, it will buy your product on the basis of real and perceived value, when compared to other similar choices. Lots more can be said about pricing and sales. Don't fall into the trap of using your cost as the price of the product.