Lat minute.com have a 7 night Holiday from the 6th to the 13th April in Lake Louise Canada staying at the Lake Louise Inn for £299 per person based on 4 sharing. Price for 4 =£1196 plus I should think some credit card charges etc.
this is a room only deal but will include flight, luggage and transfers.
Lift pass and ski hire is quite expensive in Canada but the skiing is great.
To find the deal I clicked on the canada ski holidays link about half way down the home page.
There are also some deals to Banff for £314 per person however these are on March 30th so if you have kids in school it would mean taking them out for a week rather than just 3 days.