Apologize for bumping an old topic.
I recently started reading manga on my tablet. I don't like the heavy apps that allow you to download manga from other websites. I just wanted one that lets you view zip files (like the ones offered in the manga torrents here). I've been using SCViewer
and have been really happy with it. It is extremely lightweight and free to use. It supports swiping from right to left, zooming, and a bunch of other random features that are helpful.
Due to the nature of the manga industry and digital distribution there aren't many places you can legally download translated versions. The best place to look would be the American publisher's website (or the publisher of your country). If not there they would have links to where you can legally download copies. If they do not then there is no place to legally download them. At that point you need to resort to using scanlation groups' translations if you wish to consume the media.
If you really enjoy a series and wish to support the creators you can meet them half way. Purchase official physical volumes until you meet the amount you wish to donate. If you want to give them $20, you can purchase 2 physical copies.