How much should I charge?

you should calculate all of your costs. labor, overhead, raw materials (if any) then add a profit margin. percentage of what do you want your profit should be. after that, do some market research. look for competitors and see what's their price. you can also check the quality of their product compared to yours. then be logical about it. ask yourself if you are the consumer, what would you prefer? if you can't be logical about it, ask a trusted someone to help you. its also good to start at a low price, w/ very minimum profit margin at first since your product is not yet popular. after that, you can start climbing your price. hope i helped...

Calculate all your costs, think about a fair profit margin and set the price. If people aren't happy about the price and you see that in your statistics you lower the price. It's basic economy but there's no real surefire way to calculate the best price unless you do market research.