I personally think there is a continued shortage of LRPs, and it must be due to high demand of sending ammunition to Ukraine. Ukraine forces are likely not shooting as much 5.56 nato as they are 7.62x39.
I have seen every other type of primer, in quantity, no restrictions - My local Cabela's has been fully stocked with them all, including large rifle magnums (side note my 45-70 smokeless trapdoor loads benefit greatly from magnum primers. c/r the late Spencer Wolfe's book).
I have seen LRPs at gun shows - even in quantity - with the exorbitant prices. Sometimes I've seen them sold at a small gun store with just a few flats on the shelf at over $100 each. In either instance the packaging clearly shows they must be quite old and have been hoarded for the occasion of obtaining the high price. If I were a small store with a good supply and set the price at, say, $200 per 1k brick, it would be very difficult to move any large quantity. That gun store in OK could be at auction for many reasons - such as an owner passing etc. before he had the chance to move all his reserve product at the stupid price he was likely asking. Just my 2cents.