I did one from i-to-i (
www.i-to-i.com) which was both online and in the classroom. I am nearly finished their TEFL diploma and it has made me realise that I should be doing more study in my field of work. I am lazy these days 'cas I teach children and don't prepare as much as I used to when I was teaching adults. Having said that I will end up back teaching adults again eventually
Also I get a pay rise if I do a Tefl course
But the money is not the main reason for doing it.