Since the start of 2020, we have had extreme difficulty obtaining primers. Manufacturers are not suppling them in any sizable amounts to distributors and the distributors (when they get them) cannot keep them in stock for more than a few hours.
Although we’ve spoken to a few manufacturers over the past months, trying to get a handle on the situation, they all say the same thing. Primers are going to the manufacturing side to fulfill the high demand for ammunition.
Do we see this changing soon? No, afraid not, since the election (as of today) is undecided, it will be awhile before you see any change in the primer or bullet supply.
For a detailed look, take a look at this Guns and Ammo article, Great Primer Shortage of 2020.