The only way to know for sure if the prices that you are charging are fair to your customers is to run a pricing analysis. If you do this, then you can guarantee yourself that you are on the right track with this one.
When you do this, you will discover the exact price that you are going to need to charge in order to get the most customers to purchase your products. Anything short of this is going to leave you guessing on what kind of prices you should be charging. Just make sure that you do the analysis as soon as possible.