@floridapalms, agree with you there especially if youre after first/last prefix notes, however the majority of my notes have come from circulation before they have been circulated, if that makes sense. the absolute best place to pick up notes in unc form is from Medicare. 9/10 times when I need to get a refund from there it is always UNC notes that I am given. Last week I was given three consec AA07 $10 notes. I know its just luck of the draw but it rquires no effort! Most of my unc $5 notes have come from the self serve checkouts at the supermarket.
I prefer to see what I can get out of circulation, I enjoy the chase!