They are calling it the "WA Sales Tax Rate Lookup URL Interface", here is a link http://dor.wa.gov/Content/FindTaxesAndRates/RetailSalesTax/DestinationBased/ClientInterface.aspx
The osCommerce folks seem to have something in the works already, starting with post #57 in this thread forums.oscommerce.com/index.php?showtopic=292985&st=56
Hopefully someone with programming skills can do something with this info......
Jim
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