$19 Certificate

[eLearner]

TEFL refers to teaching English as a foreign language: programs in countries where English is not the primary language and is not a lingua franca. TESOL, which stands for teaching English to speakers of other languages, is a general name for the field of teaching that includes both TESL and TEFL.

TESOL and TEFL are pretty much the same - Interesting info below.  
Review: http://www.eslinsider.com/blog/internati...rse-review
Comments: https://www.reddit.com/r/TEFL/comments/4...ely_cheap/

Interesting, and damning. I wouldn't waste even the $19 on it. You're not going to learn how to teach ESL with that. Plus, their accreditors are fake.

If a person in the U.S. wants a TESOL cert that is legitimately accredited by a USDOE recognized accreditor and is actually done properly, go with Bridge. They are ACCET accredited and they have agreements with several RA Universities. There are also colleges and univerisities online that have TESOL certificate programs so that's another route. It won't be cheap but it will be real and you'll actually learn something which is the point because you are dealing with people's lives/futures when you teach and you should actually know what you're doing.