EBAY is the answer to cheap growing equipment. Some people get paranoid about eBay selling your info to the police, but I really dont think eBay are gonna sell info to the cops about someone buying a couple of lights. Im sure that if you ordered ten 1000w HPS lights and a few hydro growing kits they might be interested though.
Try and find a person that lives locally thats selling stuff. I found someone selling a 250w HPS, ballast, reflector (decent 'enclosed' one, not them useless Dutch Barn jobbies where light gets reflected out to the sides aswell), timer and relay for £90, so I snapped it up. Probably couldve found it cheaper, but when I went to collect it (did the deal outside of eBay) we ended up having a toke and now Ive got a new friend.