I'm in Oliver BC, 20 miles from a re-shipper in WA and bring stuff from FleaBay and Amazon acrosss frequently. Anything new up to $200 they usually let slide, same for used lathe parts. A lot depends on the agent. Last used lathe (11 in Logan) was brought across free as "parts for one I already own". Mind you it was in pieces and filthy.
Have a receipt with you and specify it's NOT for business use going down and coming back.
But you never know....I brought a used BMW across that had everything not needed stripped out and they tried to ding me for the AC the car didn't have anymore. Their reason? "ALL BMWs have AC".