For algal food and a great variety of culture apparatus:
Aquaculture Supply
33418 Old Saint Joe Road
Dade City, FL 33525
352-567-8540
http://www.aquaculture-supply.com
For inexpensive nylon mesh in a range of gauges, nylon hardware, rod, tubing, and various other specialty items:
Small Parts, Inc.
13980 N.W. 58th Court
P.O. Box 4650
Miami Lakes, FL 33014-0650
800-220-4242
http://www.smallparts.com
For a good selection of tubing and plastic tubing fittings:
Bel-Arts Supply
http://www.scienceware.com
For small electric motors:
McMaster Supply
http://www.mcmaster.com
Polypropylene vessels for all kinds of uses in animal culture are available at any discount department store. We obtain acrylic sheet at a local plastics supplier. Small quantities are often available as leftover pieces cut down from full (4' x 8') sheets.