It might be too late but I saw them at my local Dominick's grocery store (in Northbrook). I'm sure many common grocery stores like Whole Foods, Jewel or farmer's markets had them. Good luck!
I picked up a few Meyer lemons at Market Place on Oakton @ 4817 W. Oakton, Skokie this past weekend. They refer to them as "sweet lemons," but they're Meyer lemons. I cut one up and put it in a green salad. Delicious.