Pushchair for up to 25kg (Westcliff-on-Sea SS0)

Hi, thought I'd ask but my son struggles to walk long distances and we rely on the pushchair a lot but he's grown out of our current one and due to him being over the weight limit its starting to bend and we don't want him in it like that for safety reasons. If anyone has one that would be awesome. Even if you'd like some money for it I can do a little bit