I bought my last batch on Ebay. I use them on my frag system and they seem to be ok. I bought a 4 pak and I think they were around $12 a bulb? I know premium aquatics has some clearance bulbs and hellolights always has some on clearance too.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,