Just a note for those in the market (as someone with the unusual distinction of owning ~30 Alphasmarts), a few hundred $ is more like a top of the line, NIB/serviced Alphasmart Neo 2 with bag, manual, etc.
If you just want to try out distraction-free writing with USB a used AS3000 is easily found <$50 (YMMV re. battery corrosion).