Found a semi-decent large lot on facebook marketplace a couple months back. Guy wanted something like $250. Ended up offering under asking and seller agreed. It was about 100K cards and a few assorted items (magazines, a bobble, etc). Mostly baseball, but some other sports and even some non-sport. I paid $180. I saw a box with a decent section of 90s inserts, a big stack of nice mid 60s (which turned out to be written on) and there were about 15 worn and marked up 5K boxes, which I was planning to empty and use elsewhere. I figured between the boxes (that retail for at least $5 each), the fun time entertainment value and all the decent cards I would pull out, $180 was a bargain. I probably pulled out enough to fill up 6-7 5K boxes in stars, rookies, fan favorites, inserts, Dodgers, Yankees for my trade buddy. Nothing epic or overly valuable, but just a lot of OK stuff. There may be a handful of $10+ cards if I was motivated to sell.
I put the "junk" on marketplace recently and estimated it was probably somewhere close to 50K cards. Most of the cards were nice condition, but a few beaters. There were some recognizable names, but no stars/HOFers. Just a lot of bulk. Mostly late 80s-90s stuff. I asked $100. i had a few nibbles and then a few days after listing, it sold for full price!
I ended up with a net cost of $80 for everything I kept. Wish every deal was that easy and lucrative. If I can find more large quantity deals like that one, I am going to give it another shot. Not sure if 1990s base set cards of HOFers are really worth all that much, but it's fun to pull them out of large groupings and I just can't leave HOFers in junk boxes no matter how hard I try or no matter how basic of a card they are.