Christina Warner said the sale was held at the Mount Dora home of Caylee's grandparents and returned the next day to buy more, RadarOnline said Tuesday in an exclusive report.
Warner said she also found some items belonging to Casey Anthony at the June 28 event.
George and Cindy Anthony "were very friendly and warmed up to me, but I think it's because they felt I did not know who they were," Warner said.
The bargain-seeking woman said she spent nearly two hours with the couple, but found it "very uncomfortable dealing with them" because "they would get into little arguments."
The toys Warner allegedly belonging to Caylee included a child's travel set with a garment bag, a Winnie-the-Pooh backpack and teddy bears.
When Warner went back the next day, she said Cindy Anthony invited her back into the house, where they negotiated the price on some paintings.
The woman said she videotaped the incident.
Casey Anthony was acquitted of killing her daughter, whose body was found near the Anthonys' home.
McPhee, Cokas 'working on their marriage' after affair
Duggar sisters unveil Christian dating rules in new book