Two things in life are certain: death and taxes. Except when they are not.
For the longest time, Amazon's clearest advantage over brick and mortar stores was the lack of sales tax. That advantage, however, has been slowly dissipating, at the company has clashed with multiple states over attempts to force the online retailer to collect taxes from customers, and in many cases, relented.
Overstock is more of the same story. Now, both companies, facing different sales tax rules in each state, and facing different rules than their competitors, have petitioned for a writ of certiorari with the Supreme Court.