You should be able to determine the sales rank by querying the SalesRank response group when executing ItemLookup with the Amazon Associates web service.
Request example:
http://ecs.amazonaws.com/onca/xml?
Service=AWSECommerceService&
AWSAccessKeyId=[AWS Access Key ID]&
Operation=ItemLookup&
ItemId=0976925524&
ResponseGroup=SalesRank&
Version=2008-08-19
Answer:
<Item>
<ASIN>0976925524</ASIN>
<SalesRank>68</SalesRank>
</Item>
See the documentation here: http://docs.amazonwebservices.com/AWSECommerceService/2008-08-19/DG/index.html?RG_SalesRank.html
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