Where's the best place to buy trolley bags for P1 boy?

Recently bought from Lazada this trolley bag for my 10 year old nephew. http://www.lazada.sg/3d-large-capacity-pupils-trolley-bags-1301-car2-intl-4552488.html $39 Not sure if it will be too big for a P1 boy. Would have loved to get Nikidom Roller, but was kind of too expensive (because my nephew loves bag and changes one ever so often). But I've read that it is ergonomic and I personally love the designs (love the designs on the large wheels in particular). http://www.lazada.sg/nikidom-roller-trolley-school-bag-fire-1809466.html $178 Lazada has quite a selection for trolley bags. I think some are cute and suitable for a 7-year old boy. You can consider getting from there: http://www.lazada.sg/shop-kids-backpack-trolleys/