3D Printers for $750
wired.com
wired.com
If you're in the Bay Area, TechShop in Menlo Park has professional versions of these machines and often hosts seminars where you can learn a lot about them for free, or for a moderate price ($30).
How many cubic inches does five pounds get you? Hopefully many?
http://reprap.org http://reprap.org/bin/view/Main/PartsSupplies
Makerbot is a great thing though because it makes this affordable, whatever the quality, some manufacturing capability at low quality (resolution, material choices) is better than none at all.
It helps teach the principles of 3D printing, give people a good reason to pick up CAD skills, and hopefully will produce a cool product or two.