One of my favorite tellers had a small stack of 4-90% + 2-40% for me. I offered her $20, she said too too much and agreed for $15. Turned out to be 1-WL, 1-Ben, 2-90%Ken, 2-40%ken. I think it was a good deal, for both of us.
Some banks refuse to take collectible coins such as silver halves.
I like the credit union, they are flexible. A few years ago I bought a solid roll of silver halves from the teller on the line.
She had brought it in from home and I paid her $50.
The roll was solid Walkers, including a key '38 D.