I don't know anything about something like that, but I'd have to guess that at a price like that you might be better off just getting a netbook like my Acer Aspire One or a EEE PC. I doubt there's anything that calculator could do that a netbook couldn't, and the netbook can do a whole heck of a lot more. With the calculator being about $200 (quick search shows new ones in that range) and the netbooks starting in the $300 range, I know what I would choose.
But, again I don't know anything about these types of calculators, and I am not sure what you'd be using it for, so I may be way off on this.
Def