There's the daylight balance ones at Henry's, it's about $ 7.00, its blue and its very bright, but it gets hot. I burned the top of my light cube a few days ago, its that hot.
I like the spiralled ones from tabletop studio, they dont get hot. Use daylight bulbs so you dont get yellow cast (but dont forget to set the white balance in the camera).
They dont sell it at their Ebay store, but they have them at their yahoo store:
Tabletop Daylight Balance
Hope this helps.