You visited those shops in Temple Street like Lau Choy Seng and Sia Huat? I remember buying some knives from around there. They have those nitrided stuff you are looking for. Check the pricing, and then see. We have regular carbon steel and ss stuff at home, so no experience with the nitrided stuff

this is Nitriging     

Where you all buy Nitriging wok pan? amazon.sg got some made in japan japanese brand Nitriging wok pan   What about TB? any trust one that use real iron instead of cutting corner?