lunchbox computer

Does anyone know of an inexpensive source for those "lunchbox"
style computers, the ones that have a small LCD, a detachable
keyboard (which covers the LCD for storage), and usually at least
one PCI and/or ISA slot? I'd like to use one for my CNC
controller, but don't know where to find "affordable" ones. My
websearch only brought back pricey ones.

TIA,

Carlos Guillermo
VERVE Engineering & Design