You can buy it from 0/3 baby collection. They have different weight selections such as 0-13kg, 9-18kg, 15-36kg groups of carseat. Please enter their website : www.o3baby.com.hk
I prefer Combi, because they are made in japan, and I also think the baby body struture of asian and european have a some difference, so japanese decided carseat should fit asian better.Another reason is Combi have more choice than Chicco...