http://www.ecomorder.com/techref/taxship.asp?demo=tax
An example that finds shipping rates online and calculates exact sales tax
for addresses in the state of California. Just press the Update button to
accept the "demo" address.
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http://www.usps.gov/ncsc/ provides
a service that returns the county and complete zip code for an address which
could be used in tax calculations.
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http://www2.taxware.com/taxcalc/index.asp
provides a online tax calculator that will calculate exact sales taxes for
free ten times after the merchant has filled out setup information. This
could possibly be used to provide information for tax estimating by A) setting
up an account for each store and B) doing full scale processing.
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Independant Systems
(www.taxrates.com), 1-630-858-4067,
1-888-844-4966 may be willing to price the tax rate database at a flat
rate rather than per merchant.
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http://www.boe.ca.gov/pam71.htm
California City and County Sales and Use Rate Taxes