F.O.A.M.er Jim Bal sent in pics of this super-cool foam book sleeve, featuring George Perez's superb cover to Justice League of America #217 as its front! Jim says his daughters have been using it every year since they bought it. This issue was during the brief period after Batman left the team to form the Outsiders, but before JLA Detroit. If you haven't read these issues of the series, I suggest you pick them up, they're all quite good.
I remember when this book sleeve came out, and I thought I had posted about it on the Shrine at the time, but it somehow fell through the cracks. Thanks Jim!