I've used a service years ago in my painting business. Was not impressed. Shady at best is how I'd describe the company I did business with. You'd do better hand delivery in my opinion is the best. Jump at any chance to introduce yourself and talk briefly about what you do. One or two in same neighborhood can spread the word. Keep your truck clean and signage if you can afford it. Don't forget biz cards. Hand them things out. Lots stores have courtesy display for customers.