Most scrap yards require ID but, wire is wire by the time you get done stripping it and can't be identified from salvage wire versus stolen wire.
I have over a mile of 12AWG stranded that I've been looking to strip but, the tried and true method of pulling a razor knife on it doesn't work on a AWG that small. 10AWG is the smallest I can strip with a knife. I've been looking for something like this for awhile now but, $150 seems a little steep because I'm out of the trade now and won't have access to surplus scrap anymore.