I like SG Ammo, and have ordered from them in the past, but Sam has always had a penchant for using his "newsletter" to push panic purchases, IMHO. Sometimes what he says comes true other times it doesn't pan out. Scarcity or the perception of it, will always help drive sales. And then he digs another 5 pallets of Russian made, no longer imported 7.62x39 out of the depths of his warehouse.
I guess I'm saying take it with a grain of salt.
That said... they are burning through muntions in Ukraine at a rapid rate, and I wouldn't be surprised to see markets adapt.
I should really buy some small pistol primers.