Where we bought halal meat in Itaewon. The shop is next to the entrance to the Masjid. Look at the cold storage at the right side. When he opened it, I was so shocked, a lot of meat and chicken too. I heard they slaughtered on every Friday so that is why their stock is always fresh. We can request to be cut into cube for easing cooking.
They also have some other stuffs too mainly spices and can food, all are imported and the most important thing is Halal. Another cold storage at this corner too.