These trolley travel bags seem pretty cheap at £12.99, they will be instore at Lidl in a range of designs from next Thursday (05/06/14).
Product Information :-
Made from durable material with two easy-running wheels and extendable handle to height of (cm): 101
With various outer pockets and convenient handles
Capacity (L): 68
Weight (kg): 2.2
Size (cm): H31 x L73 x W30