What do I need for customs if purchased in Canada & ship to US?


If I buy a component from someone in Canada and want them to ship it to me in the US, what should I have the seller do to get it through customs?  I'll probably tell them to use the Canadian Mail to USPS.  
Are there forms to be filled out & maybe attached to the outside of the box?  A copy of the receipt attached to the box?   Something else.  My total purchase amount would probably be $1,000 or less.
How expensive are the US customs rates?
Thanks,

toolbox149

Showing 1 response by sfar

As mentioned in another post, it doesn’t matter where the item is shipped from, what’s important, in terms of customs duties, is where the item was made. If it was made anywhere other than in the countries covered by NAFTA, the North American Free Trade Agreement, customs duties may apply.

Having said that, the enforcement of those rules seems to be arbitrary.