Hi!
I'm so into 30s it's frightening. OK, to replace vintage with vintage, check out ebay's search engine with feedsack fabric.
If you're looking to gather more fabric that is similar but a tighter weave, considered quilter's cottons reproductions are wonderful and less expensive (usually). I just found a new to me spot for repros online at
http://www.ericas.com/fabric/oldfash.htm and have purchased from their staff at quilt shows. I plan to road trip to the store soon. THEY ARE WONDERFUL!
RETRO :D