[quote name='alvano']how about the procesors any one selling pentium III for cheap?[/QUOTE]
If you can find someone actually selling them, they may be cheap. I don't think Pentium IIIs have been made for at least 4 or 5 years, nor do I believe you'll be able to find a P3 mobo, either.
If you want a computer on the cheap, look at a Sempron (can be had for about $60 and some change) and a socket 754 motherboard (about the same price for a decent one).
If you want a slightly cheaper, but decidedly less powerful computer, look at older Athlon XPs and Socket A motherboards.