Cheap second-hand car: Where should I look? Encar?

Hiya,

I am interested in buying a cheap small second hand car. I saw this website called SK Encar. However, you have to pay a deposite before getting an inspection done on the car. What if the report says it's a write-off?

Has anyone bought a car through them before, for domestic use?

Are there other websites like craigslist or gumtree which people put ads up? Even Korean would be fine. My wife is Korean and told me these don't exist.

Thanks a lot!

Herb