I bought the CAV box set of Snow White at Half Price Books for $10. I believe there are some extra/larger still galleries on it that didn't show up on the subsequent DVD/Blu-ray releases, and there's an analog version of the original mono mix (which is on the latest release, but it's Dolby 192kbps).
I don't have an LD player or the means to capture, so if anybody wants to make a preservation from this, I'll gladly send it to them.