Good point, whats ur Grow Space The Buck. lights really depends on that and number of plantshttp://www.htgsupply.com/Product-GrowBright-2-Foot-2-Lamp-High-Output-T5-With-Choice-of-Bulbs.asp
I think it's priced okay for what it is, it's just stupid to buy a 2ft bulb unless you really only have 2 feet.
And unless power or heat is an issue, metal halide are at least half the price, and can be 1/10th-1/20th the price. Figure a $200 1000 watt MH covers at least 25 square feet, you'd need $2,000+ to do that with T5's.