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Have you looked into shipping to the U.S.? I know every time I ship something to Canada, it costs more than it should, and goes into a customs black hole with no trackability and a large invoice for random fees and duties that shows up a month later.
Is it the same coming in this direction? With a guaranteed "total cost" to the U.S. removing that uncertainty, they'd probably sell more easily.
Shipping trans-border is a pain in the butt, and the costs are all over the map. When I bought my sport seats from a guy in New Jersey, I had shipping quotes all the way up to more than $2,000!
I've had excellent luck with freightquote.com They shipped my seats for about $350, including customs brokerage. They do a lot of eBay business, and really make it easy. If anyone in the US is interested in those wheels, I'd give them a shot at quoting. No affiliation. Just a happy customer.