China’s domestic brands have made huge strides in the years since 2012, creating new features and products that take into account what Chinese users want, for a small fraction of the price. i can't understand the usage of "for" in this sentence. Is this usage a conjunction or a preposition?

Can/Should I put a comma before "for" in this sentence?

China’s domestic brands have made huge strides in the years since 2012, creating new features and products that take into account what Chinese users want, for a small fraction of the price.

i can’t understand the usage of "for" in this sentence. Is this usage a conjunction or a preposition?

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