You are an expert in your craft; let us make you an expert at selling it. Duncan Sales Advisors builds Sales Tools designed for small businesses ready to take Sales to the Next Level. DSA - Sales Intelligence for the Successful Small Business. DSA is dedicated to providing solutions that create a solid sales foundation for your company. We believe in the entrepreneurial spirit of small businesses and, regardless of your craft, we know that DSA Sales Tools can take your company to the...