They show up on ebay from time to time (and there is one there now), they sometimes sell for relatively cheap money if the auction doesn't end on a weekend.
However shipping will add a lot of overhead. It's probably worth a visit to Nova's web site to see what they might have available second-hand. Shipping from the UK to Canada might not be much worse than shipping from the U.S.
For B&W, they are quite a lot nicer to work with than a drum in a Jobo.