Wal-Mart is selling - both on-line and in-stores - a Wal-Mart exclusive DVD release called Nickstravaganza! 2.
This DVD, priced at $14.44 and available right now (since 9/2 in fact), contains:
The first Invader Zim episode: "The Nightmare Begins"
3 Chalk Zone episodes: "French Fry Falls," "Escucha Mi Corazon" & "Gift Adrift"
2 Rocket Power episodes: "The Longest Day" & "Ottoman and the Sea"
And 2 Fairly Odd Parents episodes: "A Wish Too Far" & "Tiny Timmy."
Our thanks to Jeff Kuykendall for this information. Oh, and we have no idea about a "Nickstravaganza #1"; if anyone knows about such an animal, please contact us.
UPDATE: Our thanks to Michael DeGraw, who wrote to tell us that the original Nickstravaganza! release was a VHS-only item, also sold exclusively at Wal-Mart stores. It featured SpongeBob SquarePants, Fairly Odd Parents, and other Nick shows. Thanks for the info!