http://www.bigalsonline.com/BigAlsUS/ctl36...tripwlunarlighti got mine for around 40 bucks, im sure if you shop around you can find one at a decent price.
or you could go for the coralife 2x18watt pc, which is close in price, but i am not a fan of coralife bulbs, you could always replace them down the road.
both are under 80 bucks....
if you wanna go super cheap,
http://shop.aquatraders.com/Odyssea-13in-1...ure-p/51101.htmits 13'' and the bulb is probably sht, could always replace it with a diffrent brand 50/50, but for 22 bucks, im probably gonna get one...but it will be for my 2.5 FW
also
http://www.nano-reef.com/forums/index.php?showtopic=208812all these choices will sustain most zoas, softies, lps, and maybe even a monti cap if you keep up with your water quality