Your price should comprise of the true value of materials used, labour and packaging material. As our business is online there is usually no chance or risk of negotiation. You name a price and the customer will eigher order or just leave. Take into consideration that you might need to redo a request as quality expectancy is very high. Furthermore all orders are public, if you overcharge once and get this customer you limit to get others in the future. Think about fairness and ask for a price you would consider as fair if you would be the customer yourself. Do not over charge customers as you many lose the request if you do.