MobyLives says that due to a new law in North Carolina that would require sales tax to be collected on click-through referrals, Amazon will no longer partner with vendors from North Carolina.

[L]awmakers are feeling pressure from brick and mortar retailers who have to collect taxes and claim online retailers therefore have an unfair advantage...“North Carolina expects to collect an additional $13.2 million in the coming fiscal year,” says the AP report.

At this point, it looks like this is going to become fodder for a weird pool: How many states do you think Amazon can boycott before it becomes more financially worthwhile for them to collect taxes? I'm betting ten.