More locations: Now over THIRTY. More choices: special programs, volunteer positions, language classes. More security: Members of BBB, all courses externally moderated. More Accurate Info: No hand-picked testimonials, all course feedback availble online. More Support: worldwide lifetime placement assistance. More Experience-running worldwide courses for 10+ years. More FUN! ...... TEFL International
Some don't specify what type so you could do an on-line one, chea-ply.
Others do want a 'standard' 120- hour cert with assessed teaching practice, so that would be a CELTA, Trinity CertTESOL or a CertTESOL from SIT Vermont