home automation question

[Erez D]

hi guys.

i have a warehouse. it has two connections to the buildings - power and
ethernet.

i want to control the warehouse external lights from the house.

I thought of buying an X10 light switch, but it seems that each consts
around 50$, which is expensive
so my other option is a computer i can control (prefferably a linux box,
somthing like nslu2).

so:
1. anybody knows of a cheap place to buy X10 stuff (or somthing similiar) ?
2. what is the cheepest "computer" (doesn't have to be a full computer, an
avr with ethernet and gpio will do) ?

thanks.
erez.
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