225 ILCS 465/5.5

No person at a flea market shall sell, offer for sale, or knowingly permit the sale of baby food, infant formula, or similar products or any pharmaceuticals, over-the-counter drugs, cosmetics, or medical devices. This Section does not apply to a person who keeps available for public inspection an identification card identifying him or her as an authorized representative of the manufacturer or distributor of any pharmaceuticals, over-the-counter drugs, cosmetics, or medical devices, as long as the card is not false, fraudulent, or fraudulently obtained. For purposes of this Section, "flea market" means any location, other than a permanent retail store, at which space is rented or otherwise made available to others for the conduct of business as a transient merchant or an itinerant vendor as defined in this Act.