tough to find any of the really great barrel aged sours that are membership only nowadays without trading for something. Whether is be Jester King, Rare Barrel, Crooked Stave, Hill Farmstead, de garde, etc
Eric, plenty of places sell various Crooked Stave here. But maybe you are thinking about some special versions?
Beverage Warehouse and K&L always have them. I like that they have 12oz bottles.