I don't know how feasible this is anymore but before the pandemic I used to go to the bank and every time I would get some of my money back in Nickels.
The idea behind it was that I wouldn't want to go spend a bunch of nickels to buy anything, and it also allowed me to search through them for silver.
At the end of the year I had saved up several hundred dollars of nickels.
Not a ton of money compared to 10,000 but still something.