I've qot a copy of
The Silver Chair read by Ian Richardson. It's quite good, for the most part. My only issue with it is the fact that it is abridged.
Also, I purchased the Focus on the Family audio dramas earlier in the year. I must admit, it does fall short in some areas, of my expectations though, I would have listed the voice of Aslan in there, but to be honest, that has grown on me each time I've listened to them, however, I do struggle with the voice of Puzzle (as Warrior 4 Jesus mentioned) and Strawberry/Fledge, also, the voices of the Calormenes are too Western (I'm not saying they should be Middle Eastern or Asian or anything else...but perhaps something other than Western? I understand why they wouldn't want to get them as Middle Eastern or Asian, because it could be seen as discriminating, but they sound just as Narnian as the Narnians themselves...all bar Prince Rabadash who's just a ranting nut of a voice!
)... but perhaps my chief disappointment with it though is the fact that the Grand Vizier is not in the scene in that secret room in the Tisroc's house, which is a real shame in my opinion - as he had some of the best lines in the Chronicles, in my honest opinion.