[SGVLUG] Linux capable wireless hard drive enclosure?

[Braddock Gaskill]

Hi folks,
I'm brainstorming a potential project.

I need a cheap NAS-like hard drive device with wireless and wired ethernet
ports that can run some form of Linux (preferably Debian) in current
production.

The idea is to load it (or buy it with) with a 500GB HD.  On the device
build web interfaces and mirror Wikipedia, Project Gutenberg, the Khan
Academy videos, the full Ubuntu software repositories, Open Street Map, and
various open source textbooks.  Ship it to the developing world as a low
cost local library that a small school can pop onto their network and use
via a web browser.

Total hardware cost should be under $200.

The WL-HDD 2.5 circa 2005 is exactly what I want, but it is no longer
made.  It could run Debian, had wifi and wired ethernet ports, and enclosed
a 2.5" HD.  http://wlhdd.co.uk/wiki/Guide

Is there anything equivalent on the market today?

Thanks,
braddock