There were 5 "official" sets from AG. I don't think they were released like this in the sets at Sam's Club, though. This list is based by the copyright date, and I think it accurately represents how the books were published by AG.

Out of curiosity, which ones weren't in the sets at Sam's Club?

1- (the set that had the matching outfits)
Felicity's New Sister
A Reward for Josefina
Kirsten on the Trail
High Hopes for Addy
Samantha's Winter Party
Molly Takes Flight

2-
Felicity's Dancing Shoes
Again, Josefina!
Addy's Little Brother
Kirsten and the New Girl
Samantha Saves the Wedding
Molly and the Movie Star

3-
Felicity Takes a Dare
Josefina's Song
Addy's Wedding Quilt
Kirsten Snowbound!
Samantha and the Missing Pearls
Molly Marches On

4-
Felicity Discovers a Secret
Just Josefina
Addy Studies Freedom
Kirsten and the Chippewa
Samantha's Blue Bicycle
Kit's Home Run
Molly's A+ Partner

5-
Kaya and the River Girl
Thanks to Josefina
Addy's Summer Place
Kirsten's Promise
Samantha's Special Talent
Kit's Tree House
Molly's Puppy Tale