I was at East Midlands Designer outlet yesterday and Bags Etc had BOGOF offer on any bags/suitcases/rucksacks etc. The cheapest item was free and you can mix any combination. It is not available online.
Domo suitcases were available for £39 (way less than their usual price in normal stores), and with BOGOF, it works <£20, which I think is a very good price.
Not sure whether this sale is available in regular stores.
Worth a day trip to Designer outlet with Bags Etc store if you are looking for purchasing bags and picnic for children too....