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 riffer

Xpresspost USA and Expedited Parcel USA:

Name, address and phone number of sender
Name, address and phone number of recipient
Non-Delivery Instructions - (Return at Sender's Expense or Abandon)
Reason for Export (Gift, Sale,Document,Repair/Warranty,Commercial Sample, or Other)
Quantity,Detailed Description of Contents, Net weight, Declared Value in Canadian Dollars

I never bother with the net weight.  They do that anyway when I take it to the post office.  I also usually fill out the country of origin and HS Tariff No. from the Commercial Senders section to help avoid confusion.

I have no clue if any of my buyers have been dinged with duty, taxes, etc.  I just warn that it is a possibility.  I never send UPS or Fedex, as I am working under the assumption that they are doing the same sort of charges on CDA>US that they do on US>CDA