Advice for shipping from Canada to US?

Contrary to the advice to avoid the postal service, I have had good experience receiving packages from Canadian vendors shipped that way including one received just yesterday.  I buy stuff all the time from Canada, really it is not much different from buying from US vendors.  The unknown factor X right now might be a change in the political climate, which we have zero control over.

Have the seller contract with a freight forwarder on the Canadian side and have your amp customs cleared in the US and shipped to your door.  The forwarder has contacts in the US, both for clearance and transportation.  Sometimes it will be the same party who does both.  Of course, you two will have to negotiate the price for all this.   It ain't the cheapest route, but it is the easiest one for you.  

I've had customs issues with USPS shipments from both Canada, Europe and Australia. USPS lost rare Technics SP10 power supply, ended up having to search and purchase another power supply, then lo and behold they somehow discover the original power supply months later. Also have experienced shipments from Canada held in US customs for duty payment. USPS doesn't act as broker, UPS,  Fedex, DHL are brokerage agents.