I recently read on a forum that Arthur A. Levine Books (an imprint of Scholastic Corporation and the publisher of the American version of the Harry Potter series) is accepting unagented submissions for the near future. Here's a quick link to their guidelines (turns out, it's TRUE! Hooray!)
The basics:
Picture Books: Query letter + the full text
Novels: Query letter + the first two chapters + synopsis
Other: Query letter + five page samples (five poems, five nonfiction pages, etc.)
Illustration: Three sample illustrations via attachment, and links to online portfolios
Novels: Query letter + the first two chapters + synopsis
Other: Query letter + five page samples (five poems, five nonfiction pages, etc.)
Illustration: Three sample illustrations via attachment, and links to online portfolios
Happy writing and best of luck on your publishing journey!