Home / Uncategorized / Free Box Of Jiffy Corn Muffin Mix! Uncategorized Free Box Of Jiffy Corn Muffin Mix! Bysavingcentswithcoupons August 10, 2015 Save 100% when you buy ONE (1) 8.5 oz. box of Jiffy® Corn Muffin Mix.. Expires 8/11/2015.Save 100%. Share This Frugal Deal!ShareFacebookPinterestTwitterLinkedInPrintInstagramLike this:Like Loading... Related