Fansubs are tapes of the Sailormoon series which have English subtitles on them and are made solely by fans. For this reason, they are quite cheap. (Some are as low as $3 a tape) There are two groups involved with fansubs, "distributors" and "fansubbers".
The fansubbers are the people who actually place the subtitles onto the tape itself. The most popular of all these fansubbers is probably VKLL, (a link will be provided below) which is well known for doing a great job at fansubbing. VKLL not only subs Sailormoon, but it also subs other anime shows as well.
Distributors, on the other hand, take the tapes that the fansubbers subbed and duplicate them. They then sell the duplicates. This is *perfectly* legal, and VKLL seems to have no objection over it whatsoever. Fansubbers are more interested in helping people see the original versions than making money for themselves, so there would be no reason to get angry at the distributors.
You need not worry about ordering tapes from other people through the Internet. Fansubbers and distributors are usually very reliable, and will be sure to send you the tape that you paid for. If they took your money and ran off with it, then they would never be as popular as they are today. I only provide links to reliable distributors on this page anyways, so you can order from the distributors that I suggested without a worry.
Finally, I'll be getting to my list of fansubbers and distributors. It isn't very big as of yet, but if you know any fansubbers/distributors which you have ordered from before and know that they are reliable, then please send me the link of their site so that I can post it up. If you're new to ordering fansubs, it would be a good idea to visit the different sites and check out their prices. Keep in mind the quality of their tapes (they will usually list the quality of each tape) versus their prices.
Shards of Light