Scott Allen in About Entrepreneurs posts a highly useful article titled “How Much Should You Charge for Your Product of Service?”. It methodically steps you through all the factors you should consider when setting (or re-evaluating) your prices. It’s packed with information, and frankly you’ll need to spend some time considering all the points he mentions. If you do put aside the time and answer the questions honestly, you still won’t arrive at “The Number”, but you’ll be much better equipped to figure out what that number should be. Less error…less trial.