Any Insights On Whether Junk Silver Is Hard To Acquire These Days?

Silver has become in recent years has become increasingly scarce in dealers' junk boxes at their shops, and at coin shows. Unless it comes very cheaply, I am not interested.
Success rate much higher than coin roll hunting, because you have to pay a little.

My chief source of junk silver has come from auction job lots, where silver has not been the main interest of the lot.
That way, I get World junk silver at very reduced, or even zero cost, because there is something else I happen to be interested in. It also means that I accumulate junk silver at a very low rate, because it is never my main interest.

I have been successful in only one auction job lot where junk silver was the only interest. The only reason why I won, is because nobody else put in a bid. I got lucky; my bid was very low.

Well here's my inventory of what I purchased, glad I checked, they shorted me, and I sent them an email, waiting to see how they will respond.

My order was for $200 face value, (400 half dollars) Franklin 90% Silver half dollars.

Here's the accounting for what was actually received:
90% silver Liberty half dollar - 1
90% silver Franklin half dollar - 377
90% silver Kennedy half dollar - 17
40% silver Kennedy half dollar - 1

Liberty 1935 - 1
Franklins -
1948 - 1, D-4
1949 - 3, D-5, S-4
1950 - 10, D-8
1951 - 17, D-9, S-14
1952 - 15, D-15, S-5
1953 - 4, D-8, S-6
1954 - 8, D-22, S-3
1955 - 0
1956 - 2
1957 - 4, D-24
1958 - 3, D-22
1959 - 9, D-17
1960 - 1, D-16
1961 - 3, D-19
1962 - 8, D-25
1963 - 11, D-51
Kennedy
1964 - 12, D-5
1966 - 1 (40% Silver)

I checked for the known DDR's, DDO's, and RPM's, did not find any.

But the stacks are pretty!!

I don't have trouble finding junk silver coins at local shops, they all have at least some for sale. Most recently, I purchased 250 Mercury dimes for $357 on 5/22 and 50 Walking Liberty half dollars for $363 on 5/29. That's close to $40 above spot in each case.

I'm just not sure how silver can be a sound investment when premiums are so high. Where does one buy junk silver coins without huge premiums like this?

Two words that should never be used in the same sentence: Coins and investment.

Thank you. I hope to learn a lot while I'm here.

Separately, where does everyone buy their junk silver coins? On various reputable websites, it seems like I'd have to pay a premium that is 20-40% of the spot price. When I go to local coin shops or gold/silver shops, the best I can negotiate them to do is a 10% premium over spot. I buy silver as a hedge against hyper-inflation and potential negative interest rates. Those are remote possibilities so they aren't exactly big positions for me to prepare for. Even so, that still seems really expensive given that the same stores would never pay more than 90% of spot to buy.

It seems like spot price is basically not a real thing.