I was in an antique mall in Kentucky last week. They had silver half dollars priced at between $12 and $15 and quarters at $6. I bought it all for $450. Not a lot, but I’ve been doing this sort of thing for a year now. It is adding up.
I don’t think these sorts of outlets are set up to handle the rapid changes in price.
You got a great price on those quarters. A reputable place I know is charging $7.08 each when you buy 400.