Misconceptions...
Well, we do say UP North and way DOWN South... [wink]
As for the OP's statement, I have to disagree.
Having spent several years shopping both on eBay and with a number of US based vendors, I know that shipping charges can be a factor. However, I also know that I can shop on eBay and pay less (including shipping) at times and I can offset shipping costs to a degree by changing how I shop.
Always communicate with vendors about shipping. Many vendors like to ship using USPS Priority Mail International. It's a great level of service but it is also costly. I prefer to wait a little longer for my order to arrive and have the vendor ship via First Class Mail International whenever possible.
I avoid vendors who insist on using UPS to ship. I have never been happy with the service I have gotten from UPS, whether in business or personally. I have been gouged with ridiculous "brokering fees" applied for doing nothing more than collecting GST on an order and shipping is typically more costly with UPS, IMO. Canada Post on the other hand IIRC does not even collect GST on orders of less than $100 and only charges a flat rate $5 to collect the tax. I always choose USPS if I can when shipping from the US.
I avoid buying insurance if I can. I have yet to be bitten by this practice really. Most of the stuff I have shipped to me arrives in good shape and I have never had a package go missing. Knock on wood.
Avoid small orders. I find paper is expensive to ship. I would never order two pads of track warrants to be shipped internationally. I would pad the order out with other stuff I want or need to offset the cost of shipping, or better yet, print the track warrants at home and save shipping that way.
Vendors often have standard sized packaging. I've found that a box half full, ships for about the same cost as a full box does, unless the weight is changed considerably. Larger orders also spread the shipping costs over more items so the cost of the shipping does not double the price of one item.
Remember packaging for international shipping costs money too and an employee has to be paid to pack those orders. Those costs exist when shipping in Canada too. I actually feel that shipping across Canada is generally more expensive and takes nearly as long as shipping from the US to Canada. Oddly enough, items I have had shipped to me from Hong Kong, the UK and Australia often arrive fairly quickly and for less than it costs to ship across the country or from the US. Go figure.
On that bridge, did you communicate with Exactrail about the cost of shipping? I have had several orders shipped to me from Dallas Model Works in Texas. Craig has been very good working with me to reduce shipping costs. Also, he can supply much of what is in the Micro-Mark catalog, often at a discount. Scenic Express is also good about working to reduce shipping. Micro-Mark will ship most of their items via USPS rather than UPS. Communication is key. I find most vendors are more than willing to adjust their shipping practices to save me money. If they are not willing to help, I place them on my do not buy list.
I do agree that shipping charges add to the cost of items I buy from outside Canada but often the item is still cheaper, even with shipping included and in many cases I can't find the item I want where I am, so shipping becomes a necessary evil. Of course, mileage will vary but I have found that by working with vendors I can shop south of the border and be happy with what I pay for the items I order.