A listing of customers who have given permission to be called for a reference. Pay attention to the quality of your advertising materials. That's right, business cards are an advertising expense. So are letterheads and envelopes. A good business card will make you look as big as your biggest competitor.
Lets look at some of the costs.
For the savings by going to a two color brochure you can make a lot of information packages. Be selective in who you give them to. Make sure they are a qualified customer who has the resources to use your service. Don't skimp in this area. Do people call your office.