(in the US) you may be able to initially succeed, but no, it is not lawful. It's been tried before and has never turned out well for the person who tried it.
Grayslake (zip 60030), Illinois, sales tax rate is 7.00%.
The sales tax in Rockford, IL is 8.25%.
The sales tax for Peoria IL is currently 8.25%.
northbrook, Il.
The current total local sales tax rate in Will County, IL is 7.000%.
The current total local sales tax rate in Highland Park, IL is 8.000%.
County sales tax in Naperville, IL is currently 7.250% (as of July 3, 2012).
The combined sales tax rate for Kendall County, IL is 7.25%.
The current total local sales tax rate in Vernon Hills, IL is 7.25%
8.25%
8.250% is Aurora's current tax rate