Does this work with existing saves?

Yes. The mod changes a recipe during the data stage and adds no persistent runtime state. Enable the mod and load the save normally.

What is the vanilla recipe after enabling the mod?

The unmodified vanilla Landfill recipe costs 25 stone and still produces 1 Landfill.

Does this change the technology unlock or crafting time?

No. The original unlock, crafting time, category, and result remain unchanged.

How does it interact with other recipe mods?

Cheaper Landfill runs during final data fixes and halves the positive numeric ingredient amounts currently present on the Landfill recipe. Item amounts are rounded up to whole items.

Does it require Space Age?

No. It depends only on the base game and also works when Space Age is enabled.