I've researched this because it's on my list of things to get ...eventually (there are a lot of things ahead of it on the list).
The fluorescent lights that you set up yourself are superior to the over-priced combos that are sold on the Internet. That means you get one or two fluorescent grow-light tubes, the fluorescent fixture, and the chains (or whatever) to hang it from the ceiling.
You'll need a rack of some kind to arrange the plants underneath the light.
It's more a question of space than cost -- I doubt fluorescents use much electricity, and you don't have to keep them on all day (unless you're growing marijuana, which I doubt).
Unplugging any electrical appliance after use will stop any Vampire Voltage (that's a cool term the NY energy services have been using to explain the electricity that gets taken by electrical appliances after they've been turned off -- I don't know if that's a national thing).
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