(Re-offer due to the joys of school finance teams!)
We have, free to a good school:
Several 3com Baseline 4400 Switches 10/100Mb
A couple more random Baseline switches all 10/100Mb
Modules for the 4400s - a couple of fibre modules and a few Gigabit Ethernet modules.
Also we have a set of stacking modules for these too.
They're not too bulky so will fit in a car. Part collections welcome!