Lots of factors involved with pricing. How much time does it take to build? How much content do you need to load? How much traffic does the Bot serve? How much price can the market bear where you are trying to sell? I've seen several questions about pricing in this forum. It really boils down to what's it worth it to you to do the work balanced against what the client is willing to pay. I started selling bots earlier this year and it's not easy so I would encourage you to have a good client acquisition plan.