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Bulk Reef Supply , while on a group buy, is one of the cheapest.
As far as type, I really like the ATI Aquablue Specials, for a white bulb. In combination with the Aqyablue Plus and the Actinic, for blue-light bulbs.
This combo gives you a nice 12,000-14,000k bluish overall appearance, with good fluorescence of coral colors under just the blues.