In case you haven’t notice, WPWebHost just recently launched a brand new hosting plan for WordPress MU: WP Buddy Plan.
The plan fully supports WPMU and BuddyPress. You can host up to 100 WPMU sites with unlimited WPMU subdomains, 100GB of space, and 1TB of bandwidth from only $10/month. We could also install and configure WPMU for you for free.
If you are interested, here’s a 50% one-time discount coupon code: ‘BUDDYLAUNCH’ (without quote). This is our introductory promotion limited for the first 20 orders only.
More information over at http://wpwebhost.com/wpmu-hosting/