Poetry Foundation is looking for pitches (not submissions) for two of their prose columns, by poets:
-- This Be the Place: In "This Be the Place," poets explore the mysteries and meaning of a particular place. Subjects should be specific, personal, and unexpected (not your home or an entire city, for example, but somewhere in that city that matters to you). Essays in this series are generally 600-1,000 words.”
-- Remembrances: “Essays in the "Remembrances" series pay tribute to poets who have died in the past year. Generally, they should be written by someone who personally knew the poet who died and can speak to them as a person (rather than just speaking about their poetry). Examples: Kevin Prufer on Russell Atkins and Philip Metres on Lev Rubinstein. We are open to exceptions, such as tributes for notable people who are not always thought of as poets, such as the piece we ran on Kris Kristofferson. Essays in this series are generally 1,000-1,200 words.”
They pay $700 for This Be the Place (700-1,000 words) and $1,000 for Remembrances (1,200-1,500 words). Pitching is via a form.  
(Poetry Foundation also runs Poetry Magazine; to submit to that, see their guidelines and submit via Submittable.)