|Forgive My Fins|
|Fins Are Forever|
|Just For Fins|
They're available for pre-order on Amazon (Forgive My Fins ~ Fins Are Forever ~ Just For Fins), and hopefully they'll be up on other sites soon for your listening pleasure.
FYI, the narrator I chose (Emily Bauer) has also narrated Meg Cabot's Insatiable books and Susan Beth Pfeffer's Life As We Knew It series. She's awesome!