Any recommendations for car seats? My boy is over 9 mths n 10kg, most probably be getting a convertible one next. Where would be a good place to shop?

Consider Joie Every Stage. $400 from Takashimaya and Robinsons. Can rear face newborn to 18kg, front face to 36kg. It has a relatively high rear facing weight limit at an affordable price. Can use for your next baby also. I have the older Joie Stages. It's much safer for young children to rear face. 5 times less likely to be seriously injured after a crash when rear facing as compared to front facing. Recommendation is to rear face to minimum 2 years old, ideally to 4 years old (they do that in Sweden). If you aren't convinced, look at how the front facing kid's neck is bent suddenly during a crash as compared to the rear facing kid: https://youtu.be/fKIeExpDLDA