I guess they just didn't send any to the DC metro area this year...
I was able to find some at the Safeway in Dupont Circle...I had checked Giant in Rockville and Rodman's in Wheaton with no luck, but my wife happened to see it at Safeway on a random trip last week.
If anyone has a Publix in your area, check there. In the Nashville, TN region they're the only chain that is selling the Passover Coke this year (only in 2 Liter form).
On a side note, the Sam's Clubs in the Nashville area are also selling 6-pack glass bottles (15 oz. size I believe) of sugar Coke in cases of 24 (4 six packs).
Man, I am glad I live in Texas where you can find Coke from Mexico made with real sugar in almost every grocery and convenience store.
I've had Mexicoke and it beats HFCS hands down. But I've also got access to sucrose coke made in the Allentown PA bottler. It puts mexicoke to shame, much tastier and bold flavor.
Looking forward to sampling Passover coke this year. Off to find the 2010 thread.