I need the molar absorption coefficient for sodium chloride at 600 nm... Any help?

Given that NaCl forms colourless solutions, I'd say it's around 0. Why would you need to know that?

I need itfor some colorimetric calculations... And what about kmno4 at 600nm

Still close enough to 0 for it to be a bad choice of wavelength for most purposes

http://www.chem.canterbury.ac.nz/LetsTalkChemistry/ElectronicVersion/ElectronicVersionNew/chapter10/spectroscopicmore.shtml

I need itfor some colorimetric calculations... And what about kmno4 at 600nm

Well yes,I figured that much. What type of calculations?