I've been cryogenically treating pretty much all my cables, receptacles, etc. for about 20 years at Bayson Heat Treating in London, Canada. Take Five Audio used to have all their stuff done there (they acquired their own unit a number of years ago and, yes, I do believe they did that and cryo treat the stuff they sell as cryo treated) and Audio Sensibility has continued to have all their materials done there, at least until very recently when Bayson has experienced troubles with their unit. I'm hoping they can fix it and get it back up and running.
Over the years I've had lots of stuff come out of the unit with Steve's (Audio Sensibility) and Gene's (Take Five Audio) stuff.