PP offers the option to use F&F and, while their instructions indicate suggestions of when/how it can be used, I do not remember reading any hard and fast rules about when it cannot be used.
I have been using USAM for most of my buying/selling, primarily because of the ability to communicate directly with buyers and sellers, as we could formerly do on A’gon. By communicating directly, I can at least learn a little about the person I am trading with, which gives me more confidence to use F&F for lower value trades of around $1K or less.

