Oblig: sales/retail taxes in the US vary city-by-city. While just like the rest of the world: US companies put their MSRP on products - but it would be unfair to expect retailers to charge the MSRP and eat the tax themselves because some areas have zero sales tax but others have a 10% tax. That's bigger than the profit-margin on many items sold at retail - and the simplest solution is just to have everything understand that the price on a box is the pre-local-tax price. And everyone (most people? or just most people on HN...) know roughly what their local sales tax rates are anyway (mine's around 9%) and as everyone pays by card having exact change isn't an issue.