Where can I find a cheap MH fixture for a 24 gal nano cube online?

Cheapest would be a Viper fixture most likely. Check with Aqua Buys to see which are the cheapest.

here is one from aquabuys that you could put in the hood, if you added better fans and what not

http://www.aquabuys.com/miva/merchant.mvc?Screen=PROD&Product_Code=70w_mh_retrofit&Category_Code=d9&Product_Count=0

Send ChrisOzment a PM...I think he has a sunpod that he is looking to part with.

a 1K halide would do you great ;)

a 1K halide would do you great ;)

1K.....isnt that like BRIGHT red? The color of a match flame? Interesting........lol