Just checked and yes he does offer gift certificates.
You can see the blurb about helping him fight his lawsuit in DC in the upper right corner of page at link below.
We are purchasing them with no plan to redeem them, but it says the gc’s never expire - does that mean he will have to carry them on his books and tie up the money instead of using it now ??
You could tell them the certificates are to be redeemed by him. Also postal money orders or checks probably would work.