Nice to see that you have a target niche. Not many hosts have that.
If you are local, have you made personal contact with some of these businesses ?
Spread the word that you exists, do not fall into the trap to sell based on who got the lowest price or not. Sell on quality.
From what I've read at many of the hosting forums that I visit, the people who want to pay as little as possible and lack the knowledge to do the work them self are usually the most demanding customers you could get.
I've always said that it's really nice to go on a gut-feeling and denying a potential customer service and then be right about it.
I wish you good luck!