Fansubs are basically Anime with subtitles done by fans. A lot of Anime fans don't understand Japanese, hence rely on English subtitles to understand what they're saying. Fansubs are meant to be distributed freely, and if you do find yourself paying for fansubs, the only thing you should pay for are the shipping and cost of the tapes themselves.
There was a fansub for MKR, but it never got finished, or should I say nobody managed to get their hands on most of the second season episodes. Nobody really knows if the sub ever got finished or was it just a distribution problem. The sub ended somewhere in the second season. However, with the coming of the commericial release from Media Blasters, all fan releases were ceased as it's a rule of fansubs. If you find any episodes of MKR online, they're either the old fansubs or rips from the Media Blasters tapes, both of which are marked illegal.
In the recent years, as internet connections became faster and faster, a lot of people have completely skipped even buying bootlegs and download Anime directly online. Much like the downloading pirated computer programs, movies and music, this is once again in violation of copyright. It is sad however that people tend to take this for granted - you'll be surprised how many "fans" will boast about how much Anime they "own" but have never bought even a single legit DVD.