@ Ml -
You won't find anyone to give you an answer. This isn't what you'll want to hear:
See, when we sign an agreement with a Mystery Shopping Company, (Your "Independent Contractor's Agreement or 'ICA'"), we agree to not reveal the names of their Clients.
Also - this forum has posting guidelines and specifically states: "Do not reveal the Clients of Mystery Shopping Companies". (It's in the text directly to the right of the little yellow header posting box).
You'll need to sign up with as many companies as possible and a good starting point is the list at the bottom of every page under "Official List of Mystery Shopping Companies".
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Proud To Be A Soldier's Mom