Right now, you can get a $25 bundle that combines the core rulebooks plus a generous stack of supplementary materials for both Avatar Legends and Root TTRPGs.
If it's physical goods you seek (and not just printable PDFs) Humble is offering a $35 tier that features a physical copy of the Starter Set for Avatar Legends which includes a set of ten dice, a full-color map of the Four Nations, 21 combat action cards, and ten illustrated pre-generated character sheets.
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