No, not really. Jobslinger is suggested because you CAN search it by zip. And if you have gone through the Volition job board as well (which feeds into Jobslinger, by the way), you can try searching the job board here.
If you have 20 companies in your area that are offering work it is likely you have about exhausted the resources for the moment unless you live in an area that is the lifeblood of chains. If you plan on continuing shopping an expanding your business, it is about time to settle down with a list of legitimate companies--either from here or Volition or the MSPA an just start signing up with them all. Most will not have jobs in your area more than likely, but as the economy improves I suspect many clients will try to grab more market share and start or resume doing shops. Companies will generally contact you if/when they have a client in your area.
With more than 200 companies, I only work with 30-40 of them per year, though more have shops that just are not worth the gas or time to do.