And the only variation I've ever run across on the Joliet $5's is the solitary chip I found with a blue "Harrah's" as seen on the chip on the right instead of the standard purple "Harrah's" on the left. (Thanks for taking the effort to scroll the scan, I'll get the hang of properly sizing scans sometime.)

I keep looking on every trip, but no more of the blue letter variety. Has anyone else managed to snag one?