I don’t know exactly where you are, but I noted on the internet that a zip code in Westchester County is 10601. I put this in Jobslinger.com and within 30 miles of that zip code (including NJ cities), I found 2236 job posts. Now don’t get excited—most of these jobs are long since taken and many will be listings in a number of towns by the same company. You want to use the list to find WHO shops in your area and later you can watch it for current posts or go directly to the MSP's websites.
Kern Scheduling – (They are not an MSP but a scheduling company) is scheduling bank shops,
Ath Power Consulting – bank shops
Shop ‘n Check – Fast food
Customer Service Experts – restaurant
Direct Scheduling Service – glasses shop
Coast to Coast Scheduling – gas station audits
This is just a sampling off the first page and with that many jobs there are going to be about 40 pages. You can certainly narrow it down to look at jobs closer to your zip code, but for purposes of who shops your area, I would leave the area somewhat large. Jobslinger.com is a free sign up and well worth it just to see who is currently shopping in your area, even if the jobs for this month are gone.
Good luck. There are a lot of shoppers in your area that I have run into on various forums. Make notes of when you see shops post so you can be on the MSP’s job board those days next month. Some tend to do posts on the 23rd-25th of the month, some the 3rd Tuesday, some are purely random. You just need to add reminders on your calendar around the days when you have seen shops post to be sure you check.