You guys' old HP calculators are getting expensive. A HP32S is >$100, a HP41C/CV/CX is $200 with no modules. The 1970s' models are a bunch too.
I have several HP12Cs, a HP11C, HP41CX, and gave my HP48G to my dad. I used to be more interested in programming HP calcs, but that interest is waning. Now you can carry a full Windows PC in a 5" x 3" x 1" package with 1GB RAM and 120GB hard drive, and run anything you like.
http://www.oqo.com