I remember in 62 buying a Vibroplex Presentation bug in a store in Fayetteville. This was after graduating and before being sent to the 1st on Oki. I don't remember what kind of store it was. Not a lot of stores sell bugs, usualy ham radio stores.
If I got my information right the 109 was made in two versions, one for the military and another for clandestine operators working for the CIA in Third World locations. It was designed to be operated by someone with little expertise in HF radio communiactions. It would load just about any type of antenna and was produced in a three piece modular configuration that included small components that would be easy to hide. We had one of those as well as a few PRC-74s complete with coder burster devices in the Battalion communications locker.