Gathering 'best practices' for how you incorporate costs for supplies to be used specifically for a client's cake that you *may* or most likely will use again.

I have a bride wanting a specific damask stencil pattern set for her cake. As you know, stencil sets can be quite spendy, but is it customary to include that full charge into the price of her cake, or is it more common to buy the item and share the cost of it partially with the bride and categorize the other part of it as supply/business development. Or consider the item overhead.

what do you do?
thanks!

overhead. The cost of supplies is just the cost of business. Use those stencils on a dummy cake at a wedding show, and you'll get orders.