As of June 2015, good examples of APA-formatted papers are on websites for Purdue University, the American Psychological Association and Illinois State University. Purdue's Online Writing Lab has a page that links to a PDF of a sample paper. Highlighted comments describe format and section requirements.
At APA's site, the page for the Publication Manual of the American Psychological Association has a link to a sample paper. Click on the Learning APA Style tab. On the next page, under Browse Learning Resources, hit Sample Paper. The next paper displays different types of samples, including one-experiment and meta analysis papers. Dr. Jeffrey Kahn's page at Illinois State University's site links to a sample paper from Guides for Students, Scientists, and Educators.