Does anyone know of an oset battery bike for sale in Devon Cornwall preferably?

HI folks, now thinking towards xmas for my boy aged 7 and wondered if any of you know of one of these not really being used much that might be up for sale soon.

I've heard there quite good, and its either this or a yamaha pw50 according to those advising me.

I should add that i know nothing about bikes.

Any thoughts?

Thanks.

Rcm trial sport in St day 01209 820896 he's a good chap

Cheers martyn