[benologist]

Chromebooks start below $200 and can install Ubuntu -

http://www.howtogeek.com/185039/4-things-to-keep-in-mind-whe...

http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Dap...

Lots of cheap Windows laptops too -

http://www.amazon.com/s/ref=amb_link_357131882_13?ie=UTF8&fi...

There's also browser-based IDEs, maybe you can just connect a monitor + bluetooth keyboard with your phone or tablet -

https://www.c9.io