You can write him at this address:
Gary Yarbrough #09883-016
PO Box 7000
Florence, CO 81226
This is how you can send him money for commissary:
This has to be a POSTAL money order or it will be returned to you, and be sure to put his registry number (09883-016) on the money order.
Federal Bureau of Prisons
Post Office Box 474701
Des Moines, Iowa 50947-0001
If you do not feel like going through all this to give him commissary money, you can do the go fund me and just put a note that it is for his commissary, and I will get it to him. You can also paypal me at firstname.lastname@example.org, and I will get it to him.
Gary really needs your support right now. He has sacrificed so much for folk. Let's show him how much we appreciate the sacrifices he has made!