Your state or locale usually has a government surplus place and you can buy them from there. It’s always a mixed bag and you have to know what you’re buying. I

Your state or locale usually has a government surplus place and you can buy them from there. It’s always a mixed bag and you have to know what you’re buying. I try to surplus equipment intact and with the cords jammed inside the case if I can, with re-use and buyers in mind.