Tamiya Rock Socker RTR 58592 from Tamiya is quite handy since it doesn't need to be assembled before you drive it. As for the scale, it's a 1:10 scale.
From OnBuy
TAMIYA RC 58592 Rock Socker Truck CR-01 4x4 1:10 Assembly Kit
Jadlam Racing Models
TAMIYA RC 58592 Rock Socker Truck CR-01 4x4 1:10 Assembly Kit
This product is also available at 1 unverified store.