Its very tough to get a real estimate as Im yet to see anyone say the total truth on how much they charge. At a $100 per crown how does china even get a look in? Just putting it out there that's all.
Ok here's a serious answer. 3 yes 3 one for what I costs to produce one for what you want your profit to be and one to make the next one. Now what your 3 are that's what you have to figure out. If you find out that your 3 is $150 and your market will only support $100 than you have to either find out how to make your product worth 150 or reduce your cost to 100 or a combination. Welcome to the wonderfull world of running a buisness.