One thing to remember when working out what to charge is where you intend to sell & how, reason I say that is because some people selling on the internet will work on volume alone & if your only going to produce a limited run of each item you don't want to be selling at the same price as the guy that is mass producing something.
Have seen some of the prices people charge on the auction sites & they must be working for nothing or next to nothing, sure some of them don't think about a lot of the costs involved & look purely at material cost.