Cosmic Sand

Cosmic Sand has a stellar value, selling at $100. It is found in about the center of the bay waters between Main Island and Desert Island, aka Burning Bay, and sold by Kerb Hart at the shop that's NOT a Black Market.

Cosmic Sand is great, but has some downsides. It requires a metal or higher tier bucket to carry, and takes about 10 minutes to respawn. Another big downside is that once you collect it from the sky, it will not respawn until whoever is holding it sells it. Similar to Condensed Joy, when eaten, you will be launched about 2.5k studs into the air, which is useful for getting to the moon.