Mr. Vermilye said his company would receive royalties from manufacturers.
The group also received indirect funds from manufacturers for parties and from advertising in its journals, according to court documents.
Buying groups are legally allowed to receive fees from manufacturers based on a percentage of sales to hospitals.
The company operates four facilities to receive shipments from overseas manufacturers and suppliers.
The benefit managers also typically receive rebates from manufacturers, based on sales volume.
The senators have asked that these companies - which also receive fees from manufacturers - adopt codes of conduct, as well.
States would not get the discounts and rebates they now receive from manufacturers under Medicaid.
Homebase still receives a few direct deliveries to its stores from manufacturers and vendors.
Ms. Hughes said she needs money so she can receive lines of credit from manufacturers.
When sponsored surfers win contests or appear in published photographs, they receive cash and products from manufacturers.