Computers are too prevalent for this.

I thought companies had problems even giving away their old kit these days, never mind selling it.

pc's are too low priced for this to be really practical nowadays. Which would you prefer, an old government pc, thats probably so low spec it can't do much more than type a letter, or a brand new entry level pc from pcworld for with a flat monitor and a printer. Unless they are practically giving them away, ie under £100 with all the kit, most people will simply go to pcworld.

In the good old days, giving all of your old pc's away to the nearest school not only gave you some nice publicity but also saved your company thousands of pounds on equipment disposal, now even schools are refusing to accept free computers.