1) 4 days is not an acceptable advance warning for a $199.95 prepub!

I can come up with that kind of money in that kind of time if I want to, but not everyone can. Some people may not even check their e-mail in time to see it.
2) The exchange rate is exceptionally high, the discount on the product page is rather low, and I don't particularly need it right now, so I decided to cancel for the time being.

However, being diligent, I first did some searching. Only after quite a while did I suddenly find an Academic Blog post stating that the price will go up to $249.95 after shipping today! That should have been posted as a Reg.: price on the product page the moment you decided it! People who consider last minute cancellations have a right to know that their price will go up $50 and not $20.
3) Given that you've had much of the text available for a looong time, why is there still no See Inside feature to help people decide?
4) There should also have been a 'You ordered this for $xxx on xx/xx/xx' message. And grey buttons.
(And, yes, I know that in one sense there has been plenty of advance warning for this, in a vague kind of way, but I would think that those who have put it off until now are precisely the people who are the least likely to follow forum threads and blogs about it, and/or the least likely to be able to come up with a large sum of money in a very short time.)