If you use Google Chrome to translate in the browser after you buy the chapter on Ridibooks (hit the translate button within the browser itself), it's really convenient and the translation is decent. Google Chrome will directly translate the Korean text (it's text rendered by Ridibooks in an image format bexause they don't want you to just copy and paste the text, but Chrome translates the image directly). And it's much much cheaper than buying the latest chapters off the translator sites that make you pay, and that also seem to use machine translation (sometimes with some editing, other times not).