Sales Tax based on where purchased or where sold?

If I purchase items in City A, and sell them in City B, do I charge sales tax according to the rates of City A, or City B?



If I purchase items in County A, and sell them in County B, do I charge sales tax according to the rates of County A, or County B?



If I purchase items in State A, and sell them in State B, do I charge sales tax according to the rates of State A, or State B?



I work in Arizona.

via Small-Business-Forum.net http://www.small-business-forum.net/accounting-taxes/9908-sales-tax-based-where-purchased-where-sold.html