I've noticed the same thing with brass prices, and not just new brass. Wonder what gives?
??
JMO-  more people are trying to shoot and load 
than anytime before, and you also have the gougers 
that buy up whatever might be getting halfway 
scarce, no matter if it's T.P. or ammo and components 
and they get online and resell high to those willing 
to pay whatever. 
Then , there's more people shooting semi auto 
everything, and we all know how much 
harder semi's are on the empties, and many 
can't find their empties and that many 
more never bother to look. 
Then , there's the fad shooters that 
buy whatever regardless of whether or 
not their current setup is accurate and 
functional. Sometime back, everybody 
had to have Lake City brass. Then, it 
was Lapua ( or something else- I think 
Lapua is the thing now)
Not to mention Remington going under. 
Etc. Etc. 
Any or all screws up the flow