I originally thought about getting an aerogarden when I first looked into growing. A few things to keep in mind though...
1) You'll need a pro or deluxe model, which will run at least $170 new
2) Aerogarden bulbs only provide 1350 lumens per bulb, and not all of that hits the plants
3) For ideal growth conditions, you will STILL need to make a climate/light controlled box. You'll need this not only to reflect light and provide ventilation, but I doubt you are able to just have your weed plants chilling out in plain view.
For about the price of an aerogarden I built the stealthbox in the pic, where I'm starting to germ some seeds. I spent extra money for 105w CFLs, but you could stack up on lower wattage bulbs for cheaper. That money includes everything: cabinet (which i can LOCK), pots, fixtures, soil, ph meter, nutes. For less than $100 I can convert it into a bubbleponic setup, and about 1/3 of that is for the nutes.
I personally wouldn't use an aerogarden because I like to have more control over all the growth variables. However, people still have success with it. Check this out:
http://www.youtube.com/watch?v=CqgWtnmCaAw&feature=PlayList&p=FC240BF699DB0E3B&playnext=1&playnext_from=PL&index=4