Since you said it is 1000 lines, I assume you worked one day at it. Okay, then let us calculate: 8 working hours for $120 each = $960 I don't know your tax rate, but adding 25% seems appropriate: $960 + 25% = $1200 Now, think about how many licenses will be sold. Giving the very small market with XenES, let's say 30 licenses... 1200 / 30 = $40 So the price should be $40 plus sales tax (where applicable). For a price of $20, you would have to sell 60 licenses of it. If you think that is realistic, $20 is okay. It just depends on your valid and experienced guesses.