generic equipment

Hello,
As we all know equipment and materials packed and distributed for the
aquarium market often cost significantly more than equivalents for other
uses (industrial, shopfitting, even dog/cat owners get some better
deals). Therefore many of us now use shoplights for our tanks now.
Anyone have any idea about where to get generically-packed versions of:

-metal halides, mercury vapor, other high-lumen lighting
-pond pumps (probably no aquarium water pumps?)
-heating equipment?

Plus any other inexpensive generic equipment you like to mention!

Seb