I think you actually have to go well into the booking process before you find out the cancellation figures see below.
If you know exactly which hotel you want and the dates tell the best price you can find and I will do a quick search here. We get some great rates in UK compared to US, I once stayed in Homewood suites for $44/night incl, American family in room next to me had paid almost $200/night.
No problems with Hotelopia discount code they send them out freely to anyone on their email database.
19. How much will I be charged if I cancel a booking?
Before you confirm your acceptance of your booking, you will be advised of the exact cancellation fee that will be applied for the particular hotel you have chosen. Reducing the number of nights booked within a certain time limit may also result in similar charges