There does seem to be a normal "supply cycle" so to speak, in what time of the year certain things are more readily available. I have definitely noticed that over the years. I expect that is due to booking orders arriving at distributors and mfgrs schedules. That is certainly affecting what we see and that system has certainly been interrupted over the last 2 yrs.
Hearing stories of export permits expiring before orders are filled, that has to be an issue inhibiting some of what we see on the shelves also. I am sure the vendors and distributors are putting in the orders, they want something to sell, but, the current situation is a bit of an anomaly.