Thanks!Welcome to the Forum!
Best of luck buying mint rounds at spot price. The cost on those is spot plus a strike fee, directly from the various mints.
If you are looking to get into bulk silver at spot price, then perhaps coin silver is a better bet for you.
Try this.
You could go to your bank branch that deals with and hands out coin. Mine is Wells Fargo on Geronimo in El Paso. Take $100 cash and trade it for $100 of half dollars.
Pick through them, and if you find some that are 1965 or older it is 80% silver. They are easily spotted. On average you will find around 1 or 2 in the bunch. Be prepared to not find any also... That has happened once or twice since I have done this. Take the other "younger coins" and cash them back in.
I used to do this once a month a few years ago, and over time I have about 60+ silver half dollars in my safe. I found a few more last month and haven't re-counted.
Do you have anything to trade? Guns, gold, maybe?
Pick through them, and if you find some that are 1965 or older it is 80% silver.