Decamired filters are easy to come by and cheap, they will modify color temperature only (i.e. warmer/cooler) CC filters come in the three primaries and three secondaries, and allow you to add or reduce a specific color, by using either a color (to add) or it's reciprocal (to reduce). A good example would be to offset the typical (older) flourescent green cast, use around 30CC magenta filtration to get a more realistic reproduction of colors.
Decide which you want before you jump (unless you want both)
A 55 or 58 to B50 adapter would allow you to use Hasselblad B50 Decamired filters (very inexpensive, a full set, 1.5, 3, 6, 12 of both warming and cooling, cost me ~$20)
CC filters are typically sold as gels, with 3x3 being the most common size, you would require a gel holder, adapter ring and a set of red, green, blue, yellow, cyan, magenta of varying strengths. Gels, once commonplace have become very, very expensive lately, used prices seem to have risen or not, depending on buyers luck.
I still use both, depending on what I'm doing, even for the evil, non analog commercial work I do.