A good way to get free sheet music is to look online at websites such as OnlineSheetMusic.com and Ultimate-Guitar.com. OnlineSheetMusic.com has music available in the form of tabs, chords and sheet music, while Ultimate-Guitar.com primarily has songs with tabs and chords.
OnlineSheetMusic.com has a page with categories dedicated to guitar music, with the ability to choose songs for easy guitar, guitar tab and guitar chords. Clicking on these categories leads to a selection of music for songs that can then be directly accessed.
At Ultimate-Guitar.com, site visitors can search for songs by artist or title. After searching for a particular song, it is easy to click on the song link, which leads to a page with lyrics and chords for that song.