Hi, labmom! Like Threemom said, there are several third-party websites/boards that you can check to give you an idea of what is currently posted in your area. Here are some good places to start:
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insta.prestometrics.com]
-www.mspa-na.org/ (they have an opportunity board, but you have to register with them to see it; basic membership is free)
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jobs.volition.com]
-www.jobslinger.com
However, there are some caveats.
As prince said, you will have to check throughout the month to really get an idea of what is currently being posted in your area. Different companies post their jobs and different times of the month. Many post at the start of the month, but I know of at least one offhand that posts on the second Friday of every month. Shops can go quickly, so it's a good idea to check the boards regularly and sign up with companies as you see them.
In addition, as Threemom said, new clients suddenly pop up (and go away) all of the time! We're a very fluid industry. You never know what's around the corner. That said, you have to start somewhere, so the above websites are as good a place as any. However, once you've exhausted the companies that you find with job postings in your area, I would suggest that you set aside a little bit of time each week to sign up with other companies. If you sign up with 5 a week, eventually you will get through the list!
Gook luck, and happy shopping!