I'll chime in with: I just bought a S&W model 10-6, used, with a lot of finish wear, but in good shape mechanically, and still good accuracy. I paid a little over $200 for a good, working 30-year-old example, which is far cheaper than the $500 that BudsGunShop.com wants for a new version (which includes the unnecessary internal lock).
It's a good thing for me, the consumer, that S&W didn't cotton-onto the "planned obsolescence" business model back then. Not so good for S&W's classic Model 10, however.