Private Parts - 3.8 million units
Miss America - 3 million units
Quivers: A Life - ?
Too Fat To Fish - ?
Oh My Dog - ?
They Call Me Baba Booey - 105K units

Can anyone out there fill in the blanks or make any corrections?
From what I have found, I think these are book sales only (hardcover & paperback) and don't include audio books.

PS Beth's co-author published a book in 2005 called Boy Vey!: The Shika's Guide to Dating Jewish Men