I remember seeing FA Ingram Mac 10's brand new in the Styrofoam box for $1400 at the gunshow in Perry in the late 90's. Back then was a lot of money but now I've been seeing used ones for $7500.
I remember in the late 70's when you could buy a MAC-10 or MAC-11 for $180--And shoot up two week's PAY in about 30 minutes, LOL! Shoulda' bought a TON of 'em back then...