you should now your actual cost of labour before doing anything and then the cost associated with making them, otherwise you may be going backwards by selling them cheaply, many business's fail because they do not know their actual operating costs when pricing a product or service, it's fine to say it only took X amount of hours and maybe $50 of metal, but to sell and recover costs/make a profit or a wage, you need to know, good luck with it all and look forward to seeing the product get out there