Our family shopped at A&P where we received Plaid Stamps. Interestingly there was lesser known stamp called King Korn. I don’t know where they were distributed but their headquarters was at the north east corner of Cark and Elmdale (Peterson) - a stone’s throw from our home. They’ve since disappeared, but the building is still there and currently houses the publishing offices of “La Raza”.
Here’s a photo of the founder, Peter Volid, standing in front of the building:
Volid was an interesting figure in his own right. I’ve just been reading about him [url=http://ourlocalhistory.wordpress.com/2010/04/25/gentleman-farmers-2-peter-volid-founder-of-king-korn-stamps/]here[/url].