"The bread is cheap."
To make the ㅇ sound you put your tongue against the back of your bottom teeth. In a robot voice, that doesn't sound very good.
No... you don't. The sound that ㅇ makes when it's in the batchim (end) position is "ng". The sound that you make at the ends of words like "sing", "ring", and "thing". The sound is similar to that of ㄴ, except ㅇ is made in the back of your throat, which is why you could've heard 빵 as "bban" instead of "bbang"