Hello to all

Hi, I was hoping I might get some help. I own a marketing company and I have had a hard time reaching business owners. I know most of you don't like sales calls or sales people but our product can really help and it's very affordable. What is the best way to reach business owners other then knocking on doors and hoping the person you speak with is the business owner. Business owners are rarely at their business or they just tell me they are the managers instead. Any advice or website that might help?