These are the World Kids sold at Dollar Tree. They cost around $1 for a 3-pack. The price point is lower on these, and it is obvious in their quality as compared to the KB versions of the same dolls. Quite a few of the costumes match the Barbie Dolls of the World series costumes almost exactly except they are cheaper, often ill-sewn versions.
Their bodies are similar to Kelly doll bodies, but have flat faces and a much lower quality. These dolls are not nearly as nice as the world kids from KB toys.
See the Multi-pack Kool Toyz set.
See a side-by-side comparison between KB Toys' and Target's World Kids in the Overview section.
See Kelly redressed in these outfits under Swapped Clothes in Kelly's Closet.
See delightful ooak creations of international dolls in Kellyklub's Li'l Dolls of the World contest last conducted in 2002.
There are six 3-packs that I know of, featuring the following countries: