My quest for a good but reasonably-priced stroller schoolbag

My son's class started last Monday and yet we havent bought him his school bag yet. The reason is we are quite tight with budget due to our ongoing house construction. I have been window shopping in the department store weeks before june but I felt overwhelm with the prices of the school bags lately. It really surprised me how the prices of the stroller school bags these days are more expensive than the bag I am using for office. So now I have to scrimp on my lunch allowances so that I could spare some money for my son's school bag. Sigh..the prize of being a mother. Now I learned to appreciate my mother more. Hopefully I could buy him one later because he will be needing it soon when the formal classes start.