Less than $100, I call it my chronic box. It's triangular shape holds 3 dual-40w CFLs totalling 240w, which just happen to be in it right now and WOW is it brigh! Every wall covered with foil, (I know I know, foil sucks, but mylar is in the mail), and also contains a removable top for easy access to tall growing plants. And no matter what anybody says about growing full cycle with CFLS, yes... it is very possible and successful, it just takes significantly longer. The only problem with it right now, I can't find a cheap enough fan to ventilate the damn thing, cuz with the door shut, it will reach the 100s easily. The fan will then be mounted into one of the sides, ciruclating air. I made this off the top of my head one day just as a project, so I know it's nothing perfect, but hey, it's my chronic box.