A good ergonomic one is very expensive. Above RM500.
Perhaps you can try to rent one for a week, if okay, then only buy. If no after buying Rm700 baby carrier and your baby don't like it, it will be a waste.
Also consider if you will be baby wearing in what condition, at home? outdoor? or air conditioned room?

I had rented Tula before. Can feel it very sturdy and good quality compared to the cheap one I bought earlier. Unfortunately, my baby don't like to be restricted in one place, so I didn't buy.