Final answer:
The best place to find complimentary children's DVDs is at a public library, which offers various materials for free with a library card.
Step-by-step explanation:
To find complimentary children's DVDs, the best place to check is usually a public library. Libraries often offer a wide range of free materials, including DVDs, for people of all ages to check out. While toy stores, movie theaters, and grocery stores may have DVDs available, they are typically for purchase rather than complimentary use.
Public libraries, on the other hand, aim to provide educational and entertainment resources to the community without charge, as long as you have a library card.