They usually go for about $17.95CAD or about 8.20GBP.
I used this currancey converter http://www.xe.com/ucc/.
This is also the going rate for the newer big box hat sets. Fortunately. The latest releases are about $13 - $15. So it would appear that the prices are comming down. Hat big box sets also have this variation in prices, but it seems more like a variation than a reduction.
In Canada, Strelets sets are also usually pretty punctual. That is, they appear in the hobby shops about the same time the turn up at PSR.