Plenty available on eBay.....for models up to '98!
I wonder if they must made more of the '96 - '98 models or if the earlier versions aren't cracking so easily? I've been holding the back of mine together with super glue and small plastic add-on pieces for years. No major signs of cracking from the front side, but it's only a matter of time.
Wonder what it would take to use one of the older versions. I know the clock is over the the left vs in the center. At least you would gain a couple of nifty cup holders!