Well... the Bambi film came out in 1942. You can buy the Signature Edition DVD+BR for $30, but you can also buy a 2 disc special edition for $7.49, the Anniversary Edition for $15.96, and a Blu-Ray for $14.27. We haven't reached the used market, where eBay can get you a copy for $5, most of which will go to shipping it to you.

There won't be a "used market" for media in the future, because media won't be delivered on physical substrate. The publishing interests have been working to eliminate it for years. Between DRM and streaming I think they'll manage to kill used markets.