Not to spam (I have no affiliation with this company) but I just received an email about Hellolights.com's yearly sale.
A good portion of their CF
bulbs (both 50/50 and daylight) are on sale for $10 a piece and under $50 orders are $7 for shipping. I picked up a 50/50, and a daylight for $27 including shipping which is about as cheap as a single bulb without shipping. It would be much better per bulb to get 3 or 4 but I have a single 24" 65w hood light (those of you with 55's would be more apt to get 4 since you'll have 2 sets of lights).
Very good deal IMO
! I'm just hoping the bulbs aren't junk....sale ends the 29th.