I hope that you are not the kind of person who believes the lowest price is the best price. If you believe that, you are deluding yourself. When comes to services like yours, the lowest price bid comes from one of two kinds of service providers. The first one is desperate and broke because nobody calls him. The second is a scam locksmith who advertises in the pay-per-click section of the search results. Scammers give one price and then charge up the amount once they get out there. When you advertise your service to the world, tell them you are willing to give them a firm, upfront price. Stick by your word. Remember, word of mouth advertising is the best way of advertisement and it's free! Great customer service will always be remembered and appreciated. Even if another company charges less, if they are happy with your services, they will want you to service them again.