stocky has put together a spreadsheet to make it easier to calculate the price of orders yourselves without having to flip back between pages. He should be along shortly to post the link here and any details. :
Is there a copy of this file floating around somewhere? This file no longer exists for me...
Company is based in DE, not ME.
FYI I can no longer access excel in my computer. I still have the copy if anyone wishes to update it.
Generally in the US, companies with a brick and mortar presence in a state must collect state sales tax for online or mail orders from customers within that state. Amazon started charging tax in Texas a few years ago when they opened a warehouse near Dallas, despite having the HQ in Washington.