I have some Re-Grip that I found "new old stock" at my local electronics shop (the place is a time capsule lol).
Aren't those kind of places super cool when you run across one....but they are less and less.
I remember back in my 20's when we were all waiting to become Rock Stars...and we would need electronic odds-n-ends, we would go to a local electronics shop, the kind of place that was probably born during the ham radio days....and that's where we would buy parts, connectors, wire, etc for DIY stuff. There was no eBay yet or a gazillion online music/audio/electronics stores.....
Even Radio Shack was like that in the 70s... including the ubiquitous tube tester that you'd find at the drug store.