Usually the correspondence materials must come from the facility. We are not 100% on how Deuel does it, but most places require the inmate to get these items from the commissary and if indigent they will be provided to them at no charge.
https://www.inmateaid.com/ask-the-inmate/what-kind-of-envelopes-can-you-send-an-inmate#answer
Accepted Answer Date Created: June 16,2016