Are available from
- The science company. (search for vacuum pumps) The ones they have are plastic body, and they get a decent vacuum but for small volumes (each stroke moves about 15ml). They come with a guage
- The tool source. Which seems to be geared toward automotive (car) repair. They have a bunch of handheld vacs just like the science company. Their Mityvac range has some aluminum/zinc bodied pumps that get to 25inHg vacuum.
- Mityvac has a list of distributors on their page.
- Ralston instruments has nice looking vacuum pumps and gauges.