Apple has removed the paid version of MobileMe from its retail stores and website. You can now only sign up for a free 60-day trial on the web.
Apple is holding an event next week, and MobileMe will most likely be revamped alongside the introduction of a new iPad model. Up until now, MobileMe has cost $99/year. There's a good chance that Apple will make their cloud-based service free for customers, or introduce some type of tiered, "pro" pricing alongside the standard MobileMe package.