Buying used, US to Canada, tax and duty?

Chryslers_rule, my pre amp arrived intact, no brokerage fee, no 'duty' but I did get railed with BOTH gst and pst?? 103.00 plus the usual 5.00 handling bit..

I suppose they would charge duty + GST but on what amount?
The duty guys can't tell the value of the parcell unless there's a sales slip on it can he?

If the sellers says he sold it for 5.00$ plus shipoping, how could you get charged on a higher amount?

USPS as in Us postal services? I'm asking 'cause i'm about to buy a preamp across the border. Is that the way to go to avoid beeing ripped off?

Thanks

I've learned a lot from other members on other threads concerning shipping. I would stay away from UPS. Damaged goods, overbilling etc. Having said that, some members here have had nothing but success with UPS so...I would say the majority suggest you stay clear of them. My seller used USPS and everything was fine.
As to being ripped off, I think the real trust is between buyer and seller, less on customs, broker etc. I would think that would be influenced by what you are having shipped, brokerage fees might fluctuate between a 13lb pre amp and a 150lb amp or a set of cables vs a pair of Mirage M3si...but it's all moot if the seller receives and banks your money order and you never see product.
I find the Audiogon folks to be well written, educated, professional types who take this hobby and community seriously. I would feel out the seller, look at his feedback, ask a few questions, the usual precautions.
Otherwise you will see, these are solid people.

Lacayen,
As stated on my way bill, PST + GST, no duty...and I believe on the retail replacement amount. The seller wrote two amonuts on the slip, the value of the piece (500.00 the insured amount), and the value of it new (1200.00). I can't see the 103.00 I paid in tax being on the 500..but what kills me was customs charged both taxes on a used piece of gear, that's not common practice. I think it's only PST one pays on used anything...where I am anyway.