I did an online course for 200,000 won last summer/fall.
http://www.koredinco.com/?page_id=34There are something like 20 modules, and after each one you have a little quiz (sometimes with essay questions). Each module's readings will take anywhere from 20 minutes to 2 hours, and the tests for each module take 1 minute to nearly an hour, depending on if it's an essay exam. You have to do one website evaluation per module (takes maybe 20 minutes each), and contribute a couple of postings to the forum per module (takes 10 to 20 minutes each). I wouldn't say it's necessarily a cake-walk, but you could finish it in about two weeks if you busted your ass, or in a month if you worked on it a little after school each day.
I got the paper. Did it make me a better teacher? No. Did it get me a raise? No, not this year. Did it make me more esteemed in the eyes of my colleagues? No. But, I have the paper, and maybe I'll stick it on my grad school applications to say that I thought it prudent to try and better myself as a teacher.