There's always good finds in Thrift stores, for anybody with the time to search. Mostly it's stuff donated after an elder dies, but some people choose quality, others had diapers supplied by hospice, etc., which were more basic versions, which still make OK diapers for doubling, tripling, etc., usually cute pink & blue.
Craigslist is another great source, usually involving a trip to someone's home to buy the same stuff. I've bought cases and cases of Abenas & Molicares for dirt cheap that way (still have some stockpiled!). The face to face meetings are usually quick and businesslike.