The Ungraded Onix #56 from Base Set (English) has a median market value of $1.74, based on 6 recent graded sales. See the full price history and live chart on the Onix #56 card page.
The Ungraded Onix #56 from Base Set (English) has a median market value of $1.74, with recent sales ranging $1 to $4 — based on 6 recent graded sales.
Where do PokéTT's Ungraded prices come from?
PokéTT tracks real graded sales across eBay, Yahoo Auctions and Mercari, then shows the median within the Ungraded grade — not a single outlier sale — so the mark reflects the true market.