do what i do ,, refurbish them and clean them,, then
either, try to sell at a yard sale ,,for a minimal price,, $50-$60 bucks complete,, then if you cant then ,,,
donate them to charity and use it as a charitable contribution so you can use it as a deduction on your taxes,, that will give it the best value
no one wants older comps like that, for 2 reasons
1. just too slow and doesnt allow much for upgrading,,
2. ebay, craigslist yahoo auctions, and sites like that,, the shipping cost is way too high to send,, its more than the value of the comp system,, average is about $50 bucks for shipping,,, for a tower and monitor
also 15 " CRT monitors are dinosaurs in todays comp market,,,
do yourself a favor,, if you cant sell them off before the holidays ,, try a comp trade show, some still buy older stuff and put newer stuff in it,, but if all fails,,
give to charity before the end of the year and claim for a tax credit,,,
or you have one other option,, take all the boards out , take all the metal and take it to a scrap yard and get some money for it,,, scrap out the boards the pins on the boards are made of 1/10 of a troy ounce of gold... alot of comp dealers i know are doing that ,,, w/ all their out dated mother boards, sound and video cards and modem and ethernet cards !!!!