I've heard some of those Star Wars dramas and they are quite entertaining. Of all the audio books I've listened to these are probably the closest I know of to what you seem to be asking for. AND you can find a lot of them at your local library (usually) which is a LOOTTT cheaper than buying them.
A few months back I bought one of The Dresden Files audio books off a clearance shelf and it was pretty good. Not a cast, no sound effects, but there are around 10-12 books in the series and all of them are read by the same guy, James Marsters who I thought did a great job.
A sort of history, non-fiction at least, audion book I'd recommend is The Proving Ground : The Inside Story of the 1998 Sydney to Hobart Race. Again, not a radio drama, but a real entertaining audio book.