This extensive list includes a number of dyes that are suitable for the dye-imbibition process.

I haven't done any checking yet, or specifically looked at the product offerings of any companies, but it's entirely possible that there are a handful of companies in the U.S. that will sell these (3 listed below) or better yet send you a sample of the dye for free. I had great luck obtaining pigment samples for color-carbon in this way. The amount that you receive as a sample will probably be enough to make many, many prints.

http://www.organicdye.com/ - http://www.pylamdyes.com/ - http://www.classicdye.com/

-----------------------------------------------------------------------------------------------------------

Cyan:
- Acid Blue 45, EK cyan dye for Kodak Dye Transfer Process. Blue not really cyan in color.
- Toluidine Blue I - CAS: 3209-30-1,CI# 63340, lightfast bright cyan hue, note: this is NOT "Toluidine Blue O" or Basic Blue 17.
- Acid Blue 277 - high lightfastness, much bluer that CI Acid Blue 45 transfers well. High mobility.
- Direct Blue 87 - I thought this was a bit poisonous but it was mentioned in a publication and it has a good cyan color.
- Reactive Blue 5 - one of the Morey Bard's dyes. Not good spectral purity; similar to Acid Blue 45.
- Reactive Blue 19 - nearly the same color as CI Acid Blue 45, higher light fastness. From Morey Bard of B.E.E.
- Acid Blue 258, TECTILON BLUE 6G - more green and saturated than Acid Blue 45. Doesn't transfer very well.
- Tracer RB Blue - Possibly CI Acid Blue 88 or 80

Magenta:
- Acid Red 58 - same dye that was used in Kodak Magenta. Possibly available from Crescent Chemical Co. Inc.
- Acid Red 80 - slightly yellower than Acid Red 58, less gelatin absorption.
- Acid Red 131 - reddish magenta color.
- Acid Red 167
- Acid Red 249, Orco Milling Brilliant Red B - bright magenta color
- Acid Red 257
- Acid Red 264 - Dr. Jay Patterson claims is good a magenta.
- Acid Red 274 - bright color, good spectral purity.
- Acid Red 388 - bright color, good spectral purity.
- Direct Red 83 - reddish magenta color.
- Direct Red 227 - good magenta color.
- Direct Red 243 - reddish magenta color.
- Direct Red 75 - similar to Direct Violet 62, good for transparencies.
- Reactive Red 49 - dark magenta.
- Reactive Red 66 - similar color to Acid Red 58 but yellower.
- Ramazol Brilliant Red R.F.C. (Hoechst) - possibly CI Reactive Red 35. Bright color, slight permanent stain.
- Hostalen Red 4 B.N. (Hoechst) - Reactive dye unknown CI name
- Acid Violet 7
- Direct Violet 47 - similar to Direct Violet 62.

Yellow:
- Acid Yellow 17 - good light fastness
- Acid Yellow 19 - bright yellow color and spectral curve but not heat stable
- Acid Yellow 34 - good yellow color, good spectral curve, high light fastness
- Acid Yellow 42 - good yellow color
- Acid Yellow 151 - metal complex might be slightly poisonous. Has good saturation.
- Acid Yellow 169 - greenish yellow.
- Acid Yellow 174 - high light fastness, good spectral curve.
- Acid Yellow 200 - good yellow color and spectral curve.
- Direct Yellow 11
- Direct Yellow 12
- Direct Yellow 14
- Direct Yellow 44
- Direct Yellow 50
- Direct Yellow 86 - medium yellow.
- Direct Yellow 106 - reddish yellow.
- Direct Yellow 142 - has long absorption tail, but has good color.
- Reactive Yellow 15
- Reactive Yellow 24
- Reactive Yellow 37 - bright yellow might have leak in spectrum.
- Reactive Yellow 86 - greenish color; low saturation narrow peak.
- Direct Orange 37 - can be used in mixture with compatible dye.
- Direct Orange 26 - can be used in mixture with compatible dye.
- Reactive Orange 86 - can make a good yellow for transparency use.
- Basilin Yellow E.3R. (Hoechst)

Green:
- Acid Green 25 - medium bluish green dye
- Acid Green 41 - bright bluish green dye. Not compatible with most mixtures of Anthraquinone dyes including Acid Blue 45.

Neutral:
- Procion Black SP-4 - I haven't located the CI number. Good fastness, fairly neutral on Kodak DT paper.
- Direct Black 38

-----------------------------------------------------------------------------------------------------------

This should be enough to get anyone started, eh?!

Also, for anyone that wants a "plug & play" solution, investigating the Procion Reactive Dyes would be a good place to start. These are readily available.

Lastly, it should be noted that I cannot take credit for this extensive list, or the hard work that went into creating it. That goes to Michael Garelick; a passionate and uncompromising researcher into this process.