U.S.-based retailer:
http://www.sciplus.com/category.cfm/subsection/4
also check ebay.
you don't need a $400 camera for visualizing glowing colonies, a cell
phone camera or better works fine
the best HEPA environment is in a laminar flow hood, where the stuff
inside is protected from you, and you're protected from the stuff
inside. The next best thing is a positive pressure box, which can
range from an open faced box where a vertical side is open and the
opposite side is composed of a HEPA filter (24 inch * 24 inch at
least) with a squirrel cage fan pushing air through. The last
box/enclosure option is pretty clunky and a pain to use, its a
still-air glove box, made of a wal-mart type clear plastic storage bin
with arm holes cut in the side, this presents a real problem
transferring things from outside to the inside.
you could also try the build in the attached PDF
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