What is the cheapest IR absorbing dye that can be used on coloring the anodized aluminum?
Depends on what IR range you are targeting. Mostly the commercially available dyes are proprietary, you may get some idea from a patent search. This book may help with generic classes.
https://www.amazon.com/gp/aw/d/0904477215/ref=mp_s_a_1_1?ie=UTF8&qid=1500332793&sr=1-1&pi=AC_SX236_SY340_QL65&keywords=P.+G.+Sheasby&dpPl=1&dpID=51vTgbhtyxL&ref=plSrch
A quick search came up with a proprietary black probably good for NIR https://www.pioneermetal.com/anodizing-finishes/optical-black/optical-black
If you a targeting a wider range or longer wavelength IR you would probably be better off looking at or developing an oxide/semiconductor coating. Some surface structures could also help
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