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PSA 10: PriceCharting; refreshed Sep 10, 2026
GemDelta shows Rocket's Secret Experiment (Gym Challenge #120) at $4.99 market price (PriceCharting raw (eBay sold fallback)). Its Delta multiple is 8.01x.
A PSA 10 Rocket's Secret Experiment (Gym Challenge #120) is currently shown at $39.99. GemDelta labels this as an unverified PriceCharting guide fallback rather than verified recent sales.
GemDelta records a 10.5% gem rate for Rocket's Secret Experiment (Gym Challenge #120), with 2 PSA 10 copies out of 19 total PSA grades and a 8.01x Delta. That describes the grading profile; it is not financial advice.