Amazon offers Emily Windsnap: Six Swishy Tails of Land and Sea: Books 1-6 (Box Set of Six Middle-Grade Fantasy Novels Featuring Underwater Adventures and Friendship Magic) for after coupon + free shipping with Prime.

Product Description:
Half-mermaid, half-human, and all magic, Emily Windsnap has had middle-grade readers under her spell for more than a decade. All six of her shimmering underwater adventures are now available in one beautiful collection of paperbacks with a bonus twelve-page friendship booklet for readers to share with their BFFs.

Includes books 1 through 6, in paperback:
The Tail of Emily Windsnap
Emily Windsnap and the Monster from the Deep
Emily Windsnap and the Castle in the Mist
Emily Windsnap and the Siren’s Secret
Emily Windsnap and the Land of the Midnight Sun
Emily Windsnap and the Ship of Lost Souls
Bonus! Best Friends with Emily Windsnap booklet