FYI - My whole set-up* cost about $125, including:

~4 plant tub
~net pots
~rockwool
~nutes
~air pump
~air stones & line
~Hydrotron
~8 oz. Dyna-Gro nutrients

(all of the above in one kit for $37 less S&H)

~pH up & down (though you can skimp here and use distilled white vinegar and baking soda
~pH test kit
~4 clamp lamps
~4 CFLs
~4 clear incandescents (get the appliance bulbs)
~grounded timer
~power strip w/ 8' cord
~2 6" fans

[align=right]*Seeds & closet not included.[/align]


My closet is in a bathroom with its own vent, so I shouldn't need an additional one. I had a few of these items already (fans, timer, power strip, extra rockwool), and I may need to get an ionizer if things get smelly, but all-in-all, it's a good, budget start for anyone looking to join the growers!