Old Navy: $1 Flip Flops (5/21)May 20, 2011 This post may contain a link to an affiliate. See my disclosure policy for more information. Wow! On May 21st only, Old Navy is offering flip flops for just $1 per pair. These sell out very fast, so if you’re interested in buying some, be sure to get to your store early!Limit fiver pairs per person.Thanks, SwagGrabber!