Recommendations for TEFL courses

I'm aware that in South Korea, for many ESL jobs a TEFL certification is not required.

However, I still would like to earn the certification to expand my knowledge and develop my skills w/ teaching ESL.

I've seen that there is a plethora of different TEFL certifications available, and the prices are varied.

Could you recommend courses (TEFL - 120 hour) that are reputable, respected by schools, accredited, online based (in class learning would be a plus) that are reasonably priced (under $400)?

Thanks a lot.

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