I wrote about the original announcement of the Ottobit here, and gave some basic info about it. Meris now has the Ottobit available for purchase. Along with the release, they have posted a great demo video showing off some of it's capabilities. This video is way more in-depth than the original teaser video. If you're a user of the 500 Modular series, it seems like it would be a great addition to your setup.
The Ottobit is listed for $549 on their website.