Where to buy Hydro supplies

So, I have got my closet, I am thinking I am going to give this whole growing thing a whirl.
Where can I buy hydro supplies online?
I am looking for a place with good prices, but most importantly, a place that is very discrete.
Any Suggestions?
Oh, and if they carry the autopot system I would be doubly stoked.
Thanks!

www.growwurks.com is cheapest

www. 4hydroponics is very good they do not they do not keep records of ur purchase

discount hydroponics has been good to me.