One of the nice aspects of living in Montana (as compared to CA) is the complete lack of sales tax. We bought a bed last week and it was such a treat to hear the price was $X and then paying $X.
My reasons for using Amazon Prime are, no tax, quick service, usually same price as local-IF I CAN FIND WHAT I WANT. So I save the tax-.055%, (maybe save a few dollars off local retail), and I can get the product without searching.
They stated that they would be charging state tax in North Carolina now so Adorama here I come! I just bought over $1380 from Adorama and got free shipping and no taxes. Just sayin'