Here is a summary of what happened.
I searched for Hotels and found one whose price appealed to me. I decided to book it. I was informed of the price breakdown on the screen showing a room rate of $53 CAD a night and $4 in taxes. This gave me a total of $692 CAD. I accepted this rate and got a screen confirmation of the transaction. I then used the Print tab to print a receipt for my records. A few minutes later I received an email confirmation that the charge is $893 and not $692. I tried to explain this to the customer services agent at Expedia with no success.