Aluminium bike for a 9 year old...

Hay All.

Seeking a ‘mountain bike’ style bike for a 9 year old boy. Want a decent quality one but there’s so many on offer and such variable quality.

Reality,, will never go ‘mountain biking’ so doesn’t need hardcore. Want a good quality one, not too heavy, but not fussed about anything too serious.

All bikes we’ve looked at seem to be either super cheap (Kmart steel) or super expensive independent bike stores… can someone tell me where / what to look at in the middle ?

Thanks !