old computers needed for enterprise day

[serendipity]

i am a techie at hall green secondary school in birmingham and we have been asked to try and get 10 desktops for use in an enterprise day we will be running to teach the kids about all the components of a machine and get them to take it apart and put it back together and perhaps set up a mini network with them. School is really strapped for cash so any donations would be gratefully accepted