I spoke with Tricare (Prime Remote, North Region) today and the lady on the phone directed me to this page. It is a listing of the companies that a pump can be ordered from without paying out of pocket. I thought it might help someone else, too!
https://www.hnfs.com/content/dam/hnfs/tn/common/pdf/Breast_Pump_Suppliers.pdf
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Re: Medical Suppliers for Pumps
edit: I clicked the link and it says page not found