Yes, it would be silly to spend that much money on a sub after paying 400$ US some bucks for 2 speakers.
Therefore, I would not buy a sub for more than 600$ US, although less would be better. \:\)

The SVS are being sold in Canada by a distributor and of course there is a 100 Canadian $, markup. Nothing new there.
I will give you and example how bad it can get when shopping in Canada. Monitor Audio RS 6 has MSRP of 1000$ US but you can buy it cheaper by 200$.
A dealer here wanted 1800$ Canadian which would be around 1500$ US. I can give other examples like that.

The only company besides Canadian manufacturers that has a fair pricing in Canada is actually believe it or not B&W!
You can have 683 for the same price at 1500$ US or 1800$ canadian!

Yes, you are correct my choices for crossover are limited by my receiver. It is a good beast although old with 100wpc (5.1).
When I bought it in 99 or 98 it was top of
the line with a tone of features and connections.