have you looked on amazon, there a bit cheaper then ebay, but there genraly of a better quality and worth the extra cash. you could also look at extended waranties for your light too although you probably dont need it unless your paying out a small fortune on an led grow light.
so some questions first, oh yes, you dont get away with is that easily lol.
grow spasce, what size??
soil, ebb n flow, dwc, flood n drain?
price you have to spend??