The American Girl stores (at least the one in Charlotte) has random book bundles available for purchase.
The first one is the Time to Travel bundle and features A Smart Girl’s Guide: Travel, Kira’s Animal Rescue and Maryellen: Taking Off.
The second one is Make a Difference, which includes Love the Earth, Never Stop Singing and A Smart Girl’s Guide: Making a Difference.
The last one is Girls and Their Pets, which includes Pets, Kaya: Smoke On The Wind and Courtney Changes the Game.
Each bundle costs $25.