Gardening

Price the bulbs, then find a cheap fixture to hold them.

Back in the day when I had to grow my, er, herbs indoors four foot long shop lights were easy to find and cheap ($7-8 per fixture). I'd hang them from the ceiling on pulleys and put in four foot daylight bulbs. The shop lights held two bulbs each, so that was a lot of light.

For instance, Lowe's has 4 foot shop lights as cheap as $12, a pack of ten daylight bulbs costs $30. You can probably get the bulbs individually, but that's what they list online.

For self contained systems, the prices aren't bad on the ones you link to. The 4 foot one looks like a clothes rack with a 4 foot shoplight hung on it. Lowe's has a clothes rack for $52 so by the time you put together your own setup, you'd spend as much or more than that one and still have to rig everything.