Amazon also offers preorders of The Little Mermaid Blu-ray / DVD Combo Pack with a Digital Copy for $29.86. Clip the $5 off coupon and it falls to $24.86. With free shipping, that's $21 off list and the lowest total price we could find. Update: Price has been updated.
Of note, this movie does not yet have an official release date, but it'll ship when it becomes available.