I'm with Bigray on this one, what the guy also didn't tell you is that if the parts shipped to you are shipped UPS there's also a duty to you if he doesn't prepay it. I went thru this a couple yrs ago where UPS sent me a bill about 2 months after i recieved the parts.
However i think you can send parts and recieve parts USPS without a duty, but not sure on this.
JMO
Zip.