I'll edit this comment to add more Simon & Schuster imprints as I search for them on Kobo.
Adams Media
Aladdin
Atria Books
Atria/37 INK: no freebies
Atria Books/Beyond Words
Atria/Emily Bestler Books (not very many)
Atria/Enliven Books: no freebies
Atria/Keywords Press: no freebies
Atheneum Books for Young Readers
Beach Lane Books
Folger Shakespeare Library: no freebies
Gallery Books
Gallery 13: no freebies
Gallery/Scout Press: no freebies
Howard Books
Margaret K. McElderry Books
Pocket Books
Saga Press: no freebies
Salaam Reads / Simon & Schuster Books for Young Readers: no freebies
Scribner
Simon & Schuster
Simon & Schuster Audio: no freebies
Simon & Schuster/Paula Wiseman Books
Simon & Schuster Books for Young Readers
Simon & Schuster Children's UK: no freebies
Simon Pulse
Simon Spotlight
Touchstone
Washington Square Press