I just went to Mead's website and they are temporarily out of stock on their site. Then I googled it and checked out the first couple of sites..It seems like it's out of stock everywhere! Here's a link I found that has lots of other zippered binders for sale :
Zipper Binders | School Supply Kits | Prepackaged School Supplies | Smencils | Zipper Binders. Maybe send Mead an email and ask what's going on? Good luck on your search!