Love the list! I've read them all.
A book that got me started on simple living/voluntary simplicity way back in the 70s came even before the hallmark Elgin book. It was called Living Poor With Style published in 1972. https://www.amazon.com/Living-Poor-S.../dp/B0012X5QDK.
The book changed my life. Just about all I own and use is used--except for underwear and shoes...and some major appliances..which are aging nicely.
Thrift shops are treasure hunts as are online marketplaces. My favorite thrift shop which benefits those kicking addictions sells books for $.25...and the little free libraries are terrific for re-cycling books and finding new ones. Does my book-loving heart good!