I was at the Berkeley Amoeba on opening day too! (Though I couldn't get over to the Haight St. Amoeba until a few days after it opened.) But for the kind of stuff I've looked for over the years, the Berkeley Amoeba's amazing finds ratio remained pretty good up until the very early 00s (at least if you went on a regular basis). I honestly think that store really benefitted in the 90s from so many people unloading their vinyl in favor of CDs. But after the early 00s, things slowly started dwindling, though the used CD section (and the discount CD racks) remained pretty strong. I still go every week and usually walk out of there with something, though. But I seldom find more than a couple of things at a time. I miss the days when I'd go in and find 10 records and have to put a few back because I couldn't afford them all! Or when you could scour the dollar LP bins and come out with an armful of records that were in totally fine condition.