About 60 pint-sized entrepreneurs and their families set up shop at Kaka'ako Waterfront Park today, buying and selling hundreds of used toys, books, clothes and other items as part of the Hawai'i Children's Discovery Center's thrice-annual Keiki Swap Meet.

The Keiki Swap Meet has proven popular for the educational experience it provides, as well as the chance for kids to make money selling what they've outgrown.

"It teaches them the value of money and the art of negotiating," said Discovery Center founder Loretta Yajima. "In most cases, the kids make the decision about what to sell and what the prices will be.

"Sometimes these are painful decisions for parents," Yajima said, laughing.

Denise Nakasato brought her 4-year-old son Tylin to the swap meet.

"It was a really nice experience," Nakasato said. "It's a real family environment and (Tylin) got to learn about selling items and got to be outside at the same time."