About 3 yrs. ago i bought a stacks injection from a guy in western Canada, don't remember the Providence and i paid with Paypal which included the shipping to me in La. Injection came no problem, UPS guy dropped it off on the front porch and i was good to go, (I Thought) About a month later i got a bill from UPS for 20 something dollars, less than $30.00. So i sent them an email and said screw you i already paid for the shipping. I got an email back stating this was a cross the border tax, so i say fine collect from them. We go back and forth a couple weeks and they tell me they are going to cancel my UPS account if i don't pay it. I say fine i don't have a UPS account. About a month later i get an email from a collection agency saying if it's not paid in 30 days it's going on my credit report. Well i have a 7.70 credit rating and it's something i don't need on my credit report, So i go ahead and pay it, and haven't bought anything else or sold anything else to Canada since.
That very tax is the reason Murrey the engine builder from Canada contracted a shop in Ohio to build engines sold in the US.
Zip.