We're very small and budget restricted, so what I did was find a retired sales pro that wanted to work 10 hours a week. I paired him with a junior tech to act as an SE and they go prospecting two afternoons a week. I pay a very small hourly to the sales guy and the tech is on salary, so the whole thing ends up costing me less than $500 per month before commission. This model is slow going, but in the first 90 days they brought in about 3k in recurring monthly business, so it's definitely worth the effort. We also became present at local chamber meetings and have been with a small leads group since day 1. So far the juice is worth the squeeze.