i bought a roll of the 3m sitkkit gold 320 at a place called cti abrasives in sanata ana. got a 45 yd roll for $29.
stew mac sells a 15 yd roll for $40? maybe more.
i use the stew mac double sided nut files
12/16
24/32
36/42
50/60
covers most of my needs for acou and electrics
i also have larger files for bass guitar nuts. 75, 90, 105 etc
the xacto .010 saws are great for high e strings and starting slots
i watched that video clip and couldn't really tell what the frets themselves sounded like unplugged. each time he played the guitar it was plugged into an amp.