Walked into an antique store haunt of mine and saw a large box of old 78 records with the magic word FREE on them. Of course I could not resist. Oldest one I have dated is 1919, most seem about the $4 to $6 range so far, but with 80+ of them and no money in them, I am a happy camper.
Some of the "hillbilly" records bring decent money. Look for Charlie Poole, Gid Tanner & the Skillet Lickers, Riley Pucket, Uncle Dave Macon, etc. I know a
young man who takes 78s and loads them into his computer, cleans up all the popping & crackling and then burns them onto CDs. The CDs sound like a new fresh recording. He even takes mumbled words and pulls them out and replaces them with the word from somewhere else in the record.
As a record guy myself, I avoid these at all costs. I recently picked up a collection that had 2 dozen 78s included. Several of them have already broken while in my possession due to being extremely brittle from age alone. Not to mention, most are worthless, unfortunately.