I can't recall who recommended it recently (Thank you though) but I just ordered 250 rounds of Fiocchi 9 pellet 12g 00B from PSA for $0.60/rd as a part of their Black Friday sales. Ammoseek led me to it. (ETA: actually $0.62/rd with tax and shipping and insurance)
Got to scratch another off my Black Friday list.
https://palmettostatearmory.com/fioc...-12ex00bk.html