Customized corporate logo padfolios were popular swag during my tenure as a corporate marketing person. I'd bet your sorority special ordered them for your convention from Leed's --- which was where I used to order them from.
http://www.leedsworld.com/products/v...6+writing+pads
If you haven't already done so, you might want to contact your organization to find out if they happen to have a few leftovers sitting around in a box somewhere. I know the companies I worked for seemed to have extras around in storage for years. Or maybe you could convince them to have some more produced to offer in your GLO's online store if you have one or as thank you gifts for contributing to alumnae fund raising campaigns.