There has been one Green Hornet DVD released so far (allegedly as a movie but is actually four episodes from the TV show spliced together). This DVD can be found here but be forewarned about the incredibly bad job Fox did in splicing this together.
As for the Green Hornet movie - as recently as last year it was being rumored that Ray Park and Jet Li would be taking on the roles of the Green Hornet and Kato, respectively. Unfortunately the project became delayed and both Park and Li moved onto other projects. This doesn't mean that a movie still isn't being planned or wouldn't feature Park and Li but currently it doesn't appear that any progress has been made on the film.
"Never give in--never, never, never, never, in nothing great or small, large or petty, never give in except to convictions of honour and good sense. Never yield to force; never yield to the apparently overwhelming might of the enemy."
- Prime Minister Winston Churchill
"Si vis pacem, para bellum."