this is a 1 kw hps ballast:
http://www.plantlightinghydroponics....oducts_id=1386

it's 165$ brand new or you can get a 1kw digital for 350$

a reflector will cost between 65-200$ and a bulb anywhere from $30-100 so you could actually get a new 1kw hps set up for as little as $260!

i just got a 1kw hps ballast, 1kw bulb, a cooltube and a 465cfm ecoplus blower for $325. i already had a ballast housing so i just had to buy a "ballast kit" and wire it myself but i think a brand new1000watt set up for that price is great. if i were you i would search around for a deal on new equipment like i did. i don't think that buying yor friends old set up for $230 is a good deal at all. used equipment is to risky, offer him $50 anfd if he doesn't want to sell spend the extra 30$ and get the brand new set-up for $260. the link i posted is a great place to get what you need if you are interested, i have got stuff from them many times and have never had a problem. i usually recieve my order 3 days after i place it! good luck