You cannot send stamps or other stationery to an inmate in a federal facility. These items must be bought at the commissary. Indigent inmates may receive these items at no charge, provided they have no money deposited into their trust account for a period of time.
https://www.inmateaid.com/ask-the-inmate/when-i-mail-out-the-4x6-stationary-to-my-inmate-do-i-put-a-stamp-on-the-envelope-or-do-i-just-put-the-coleman-satellite-camp-address-with-no-stamp-and-mail-it-that-way-can-we-mail-out-family-pictures#answer
Accepted Answer Date Created: March 06,2019