What is a good quality folding bike.?

Everyday I have to take a subway to school, and in order to get to the train station I must go by means of car. I have been considering taking bike the almost 5 mile way, as for me it wouldn't be to difficult. I am worried that taking my current bike and locking it by the train station, it would be ruined by... show more Everyday I have to take a subway to school, and in order to get to the train station I must go by means of car. I have been considering taking bike the almost 5 mile way, as for me it wouldn't be to difficult. I am worried that taking my current bike and locking it by the train station, it would be ruined by weather conditions and possibly stolen. I would like to have a folding bike that is reliable. I don't need more than one gear, as I am not trying to break any world records. I would like it if the bike would cost under 300 dollars or below, but am willing to consider more expensive options. Please help me.
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