That’s a tall task. I’ve been to dozens of estate sales and haven’t found many 3/4 sockets. Maybe some farm auctions. Most people have little use for 3/4 compared to 1/2 and 3/8, so there were probably quite a few less sets produced.Trying to find an older US made 3/4” complete socket set. I have some random pieces, needt a full set with a large/long ratchet.
I hope you find them, good luck!