Sorry BCG, to answer your question, chinese roast item shops sell cooked/roasted meat such as BBQ pork, steamed chicken, roast pig, roast duck, etc... can be fairly cheap.

These shops are everywhere in HK. It's hard to walk down a street here without passing at least one shop with meat hanging in the window.

Watch out for too much BBQ pork (very sweet!), and the roast pork is great if you like fat.