The other day I posted about Apple raising the academic price of Leopard, and while that is true it is only part of the story. Apple has raised the price of Leopard on their own Store for Education, but Leopard will still be available for a deeper discount at school bookstores (usually around $69).
Many commenters shared this on the original post, but I wasn't able to confirm this with my sources until today. The most obvious reason for this move is that Apple has no real way of knowing if you are, in fact, associated with an educational institution when you order online. Most school bookstores require you to produce a school ID in order to make purchases of academically priced software, so Apple can be assured that you are, in fact, a poor student and not just cheap.