Went in to my LGS two days ago and saw he had CCI blazer 50 packs of .22lr. There were eight boxes of 50 on the shelf. I tasked for four. He asked if I wanted more and I said sure, but I don't want to screw your other customers.
He reached under the counter and handed me a brick of them, $29.99.
I do a lot of business there and have hardly ever had a problem getting primers powder etc.
Make friends before you need them.