Used Computer

does anyone know where i can get a decent used computer for free. i doesn't have to have any more than ten gigabytes of hard-drive, and no more than half a gig of ram. i just needs to be able to handle microsoft office. it also doesnt have to be compact at all. i am not interested in doing any offers so please no links to those. and i already have a monitor so that is no problem.

- thanks, ben