Amazon has long enjoyed an unbeatable price advantage over its physical rivals. When I buy a $1,000 laptop from Wal-Mart, the company is required to collect local sales tax from me, so I pay almost $1,100 at checkout. In most states, Amazon is exempt from that rule. According to a 1992 Supreme Court ruling, only […] http://sswi.me/LUBbgs via @shellypalmer