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PSA 10: PriceCharting; refreshed Sep 10, 2026
GemDelta shows Grass Energy (Promo) at $16.41 market price (TCGplayer market). Its Delta multiple is 34.0x.
A PSA 10 Grass Energy (Promo) is currently shown at $508. GemDelta labels this as an unverified PriceCharting guide fallback rather than verified recent sales.