If your local hardware store doesn't stock it, they'll probably order it for you, especially if you need lots of it. There is a difference between galvanized and stainless--both in quality and in price.
ACE is known for carrying it, no matter where you are, and if they don't have something, they're usually really cool about special orders. I happened to get mine (Kathy, fyi) at Wichita Feed and Hardware on Johnson Creek Boulevard.