I just noticed there's a sonnet contest at Better Than Starbucks. No entry fee, deadline Dec 1. Here's the
link.
Editing to add: another contest that might be of interest to Sphereans is
this one, which doesn't explicitly ask for metrical or formal verse, but it's judged by Dana Gioia. I came across both of these on Erika Dreifus's The Practicing Writer blog/newsletter.
Nausheen