This small nutriculture system (Drip Irrigation System) was only $90 and is suitable for 10-12 plants. http://imgur.com/UaUy4 I grew 4 lettuce, 2 swiss chard and 3 arugula and 1 kale plant.
Here are the results about 50 days from seed.
http://imgur.com/FOHMY
I used General Organics...