How to make my 8 year old son's shoes last longer?

I bought my son a new pair of sneakers less than a month ago and they are already falling apart. It doesn't matter where I buy him shoes or how much they cost, within a month or two they are completely worn out. They are still wearable but they don't look too nice. He plays hard and is very active which I love about him but his shoes are taking the beating lol. I am tired of buying new shoes every 3 months but what else can I do?