Source for good sarkosyl

[Jim Bone]

I am trying to find a source for good quality sarkosyl, a detergent used in
place of SDS in nucleic acid preps (CsCl is not soluble in SDS solutions).
I tried the Sigma stuff, but when it goes into solution(10%), it turns
yellow,
similar to what happens with low quality SDS.  Fluka sells high quality 
sarkosyl (AKA N-lauroyl sarcosine, sodium salt) buut 5g costs > $100.00!
Does anyone know of an affordable, quality source for this detergenet.

Thanks,

Jim