Heavy punch bag near KT3. (New Malden KT3)

I’m looking for a punch bag for my son. He needs to man up and also get fit. He wants to start kick boxing so needs a decent and strong punch bag. If anyone has one that they haven’t used in a while and that is just collecting dust, please let me know and I will happily come and get it from you. He and I both need the exercise. Thanks.