But then again, a used HP 48-SX/GX shouldn't run
you too much either --
probably about the same as a new 50G. And if you want a nice used calc
of the non-graphing variety, the HP-41 series are lovely calculators
and you can find a nice used one for about the same price. (I'm basing
this on current eBay prices, your mileage may vary.)
THe problem with the 41 seires is tht the calculator was designed as part
of a 'system' and it's a pretty limited calcualtor on its own. It's a lot
nicer when you've added a card reader, HPIL module, a couple of ROMs,
maybe an MLDL unit, printer, HPIL mass storage, HPIL to HPIB or RS232
interfaces, etc. And that gets expensive fast. I'm lucky enough to have
most of the bits for the HP41, but I wouldn't recoemnd goign that route
unless you want to start building up a collection.
Hh,and the hP41 runs on N cells too.
-tony