This is a free book online...entirely online...entirely FREE! What could be thriftier? It's a book about thrift.
Thrift in the Household
Copyright is 1918 so try to ignore the sexism and whatnot. Most of the thrift methods are perfectly valid today.
This was linked to through a favorite blog of mine:
Frugal for Life so I'm ripping her off and re-recommending it here.