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Great idea. I would look into having them done professionally though. If you shop around, you would be surpised how inexpensive they can be. Signs done professionally make you look professional. Signs put together from scrap around the house and saw horses can reflect negatively on the business. It can look like you don't spend the money on the equipment you need. When people are driving by, they get their first impression from that sign you are putting out. They don't see the quality and professionalism that you demonstrate in your work.

Brian