is really popular in Taiwan which was where I first learnt about it. It is present in the condiment station of every hotpot restaurant in Taipei, and almost every 7-11 outlet in Taipei city sells bottled sacha sauce too. Pictured above is the most popular brand (Bull Head) of sacha sauce in Taiwan. I always buy a few bottles back home when holidaying in Taipei. There is also a mala version which is even nicer if you love spicy food. In Singapore, I think one can find it at Yue Hwa or Kwong Cheong Thye . Otherwise, you can get other brands such as Lee Kum Kee at the local supermarkets.
Full article: http://www.noobcook.com/sacha-sauce-pork/