I don't have one that I can pass along, but our office has been known to come do demonstrations with our survey grade units. We did one last fall for the 8th grade science students at North Wood Junior High. Our survey grade units are accurate within 2 cm (I'd like to use this one on one of Nonnipoppy's caches that I know of) and are very cool to show to students because you can navigate to a penny in the grass of the football field. We also bring our garmin with differential which is accurate within 4 feet.
We are continously upgrading our survey grade. We have some very old units which we still use but I will check if they might consider donating one of them at some point. Only thing is those units have been used and when I say used I mean they show that use. They still work, they just aren't very pretty after all that mud, sweat and dirt.
The Pixie with an Attitude!!