Maybe the price is based on the low number minted? I went through the motions of ordering to see what the shipping costs would be internationally... $US20 to the US... (although you mention free shipping to anywhere in the US or Canada...), but no international cost. Given the huge cost to the US, I'm actually scared to know what international would be.
I'd would be really interested in getting 25, but the cost is going to be way far too prohibitive - in the order of hundreds of dollars - and thats BEFORE exchange rate conversions!!!
But, I wish you good luck with them. And if the price did come down considerably, then I'd probably reconsider.
Craig