Mostly you would need a tray, reservoir, pump and fittings for an ebb n' flow. I am making a bubbler for cheap currently. I should make a log/journal about it. Need to find a camera. . .
Anyways, a bubbler is super easy, in both construction and during the actual growing process. It's basically a rubbermaid bin with net pots in the top and an air pump/stone on the inside filled with nutrient solution. I would look into making one of those. I am going to spend ~$50 on mine after it's all said and done.