Holiday Inn's web site - Euro
135
Expedia.com - Euro 111
Hotels.com - Euro 110
Holidaynights.com - Euro 93
Galahotels.com - Euro 89
Travelrepublic.co.uk - Euro 82
(= 40% less than hotels own site )
Same hotel + same room - but what a difference

So have booked direct with Holiday Inn as they say if you find another website with a lower price - they will match it and give you an extra 10%