Best prices according to CamelCamelCamel. You should be able to order each individually and received a $1 digital no rush credit.
I Love You Through and Through – $3.11
Twinkle, Twinkle, Little Star – $2.17
Goodnight, I Love You – $3.66
I Am a Big Sister – $2.42
I Am a Big Brother – $2.20
Potty Time – $3.95
Rain, Rain, Go Away – $2.08
A Cuddle for Little Duck – $4.87
I Love My Dinosaur – $2.68
I Love My Robot – $1.92