I'm a long time Redwall reader myself. Unfortunately, Denise - I can't answer your question, as I logged on here to ask that EXACT same question myself.
It seems that only a handful of the books are available. Ones that were published "later" in Redwalls lifespan on the shelves. I wonder why that is, and like you - I wonder when they will finally get around to putting the rest on Kindle, or if indeed they have plans to make that happen at all.
If I learn anything, I will let you know! Hopefully, you'll do the same for me, too! : )
It seems silly to not convert the first books in a series. Anyways, I'm with you guys, I clicked the request for book on kindle link too. I have a wishlist of books I'm waiting to be converted to kindle. It's a much smaller list than it used to be but this and a couple other books are still on it.