LEAST EXPENSIVE 'OFFICE' IDENTITY. The best deal you could obtain for a telephone number and address separate from your home would be to get a pager with voicemail capabilities and a private mailbox. The pager should have a ordinary phone number and not require additional code numbers that your customer has to enter to reach you. The voicemail option enables you to leave a message in your own voice and your own wording so the customer knows they are properly connected with your company. The private mailbox companies usually allow you to address your mail, for example, just #000 instead of P.O. Box #000.Together, these are probably available for less than $100 per month. The greatest advantage of having these is that if you move you don't have to go through all the expense of address changes on all your stationary. You will also not lose customers business who would otherwise have only your old number.