depends where you are from,if u are in the states try home depot or walmart.i would love to visit one of these shops,i hear so much about them.if you are in the uk try www.growell.co.uk thats where i get all my stuff.they are really good
they're going on crapy bay for bout £17 if your in the UK I managed to get them from my local hydro store (impatient) for £25 each. Good lights, nearly no heat I've used just 1 125w 6500k to veg 3 plants fine, and am now using 1 125w 2700k for flowering 1 of them (other two were males) read somewhere the 125w can only penetrate to 12 inches, so LST is the way I'm going good luck
Go to Wallmart, they have three times the selection of CFLs and Fluoro tube fixtures as anywhere Ive been.