Be careful when shipping cross border
A fellow XC member and I had a bit of a nightmare with a classified sale. The parcel was lost by Canada Post (second one lost to my address in one year) and the seller was out the amount because he gave me a full refund.
Be sure to include insurance with the parcel and keep the receipt - even minimal amounts because it places a trail in the system. I feel awful that the parcel was lost plus the XC member was out the funds from the sale. I still have to go buy the part I wanted - we both loose. Another smart thing to do is to scan in the receipt from the post office and email it to the recipient - if you loose it, there is a digital copy.
This isn't to say that any cross-border sale between Canada and the US isn't safe, but do include some mechanism to track the delivery - and hold onto that receipt. You may need it.
Cheers.