Cheap folders aren't just poor for riding, they're also poor for folding.
Don't think that just because you plan on riding the bus for 15 miles and the bike for 2 miles, that you don't have as much of a need for a quality folder. On the contrary, cheap folders are heavy and large, which will make your 15 mile bus ride miserable.
How large are you Moe (weight, height, etc)? Some of these chinese folders are made to fit small people.