The DVD is being released Tuesday, October 2nd. Amazon.com has it available on DVD, Blu-ray Combo pack and Streaming. The streaming link credits Jamie as one of the stars, but information is rather light for the other links. Netflix also has him credited.
Here's the trailer. Check out Robin/Jamie at about the 50 second mark. :)
Given this is a short (58 minutes), direct-to-DVD kids movie, I can understand if not everyone rushes to pick up a copy on Tuesday. However, thanks to the 2 1/2 year old niece-like child I know, I can totally rationalize placing my pre-order. ;)
ETA: The DVD seems to be available already in the UK.
ETA2: It seems as if Robin Hood is a Bamber-Norton-Griffith family affair. :)