I just came across the journal Young Scholars in Writing: Undergraduate Research in Writing and Rhetoric, which has seven years of peer-reviewed articles online. As the site states,
"The 'young scholars' in our title is not a marker of a scholar’s age but rather of his or her experience with discursive inquiry in writing, rhetoric, and related topics. Thus, we invite all young scholars in the field to submit your work!"
This is a great opportunity for promising young scholars.