This was in the summer of 2022, from Mack's Prairie Wings (
https://www.mackspw.com/). It might have even been a sale, but don't remember. They don't have any now.
I tend to be one of those who check on ammo availability and prices frequently, and buy before I need it. (Also have plenty of shotshell handloading stuff, in several gauges, including bismuth shot in various sizes.)