Each $130 silver pen bore the agency's seal and Administrator Pruitt's signature, according to the documents, which were obtained by the Sierra Club through a Freedom of Information Act request.
"Yes, please order," an aide wrote.
The purchase stands out not only for the cost but also because it was approved by a close aide who Pruitt described in congressional testimony last month as "longtime friend."
Pruitt's actions are currently under scrutiny by investigators at the EPA inspector general, the Government Accountability Office and Congress. At least 12 investigations have been opened.