I am not associated with them but the startup ChocaByte (chocabyte.com) is taking 500 pre-orders of their $99 dollar unit. I was wondering if anybody has seen or heard about how it works as it was presented at CES this year. I have only seen a video.
Other chocolate 3D printing offerings out there are the Choc Creator V1 from ChocEdge (for professionals) as well as the piqChocolates design-your-own and print service (a Kickstarter startup).
Food 3D printing is a very exciting area which I follow at @foodfabbing.