Qualification and Locations
The general qualifying amount is $50, which allows the purchase at about $10-20 onto the current purchase. This is per transaction, not per amount spent.
Most of the time a Purchase with Purchase is only seen at participating American Girl Place locations. It is rare for a Purchase with Purchase to be available through the website, though they have been seen.
Purchase with Purchase sets may not be universal across all AG stores.
Some outfits have been uniquely available through Purchase with Purchase, such as the Vacation Outfit. During the holidays, a smaller holiday set has recently been released, mostly consisting of a sweater and headgear (such as a hat or headband).
Sometimes, unique purchase with purchase sets are made available through the website.