Nidoking

Nidoking (45/114), the Rare from Steam Siege, has an estimated ungraded market price of about $0.85. Note: 15 other cards named Nidoking exist across the sets Riffle tracks, at very different values; check the collector number.

This page covers Nidoking (45/114), the Rare (about $0.70–$1) from Steam Siege.

The other versions: #150/147 from Aquapolis (Rare, about $440–$560); #H18/147 from Aquapolis (Holo Rare, about $200–$260); #11/130 from Base Set 2 (Rare, about $36–$47); #11/102 from Base Set (Rare, about $35–$45); #8/112 from FireRed & LeafGreen (Rare, about $24–$32); #174/165 from 151 (Illustration rare, about $18–$24); #24/147 from Aquapolis (Rare, about $14–$19); #31/110 from Legendary Collection (Rare, about $12–$16); #6/102 from Triumphant (Holo Rare, about $10–$14); #29/111 from Rising Rivals (Rare, about $7–$9); #45/108 from Evolutions (Rare, about $4–$6); #34/132 from Secret Wonders (Rare, about $4–$5); #58/116 from Plasma Freeze (Rare, about $3–$4); #59/181 from Team Up (Rare, about about $1); #034/165 from 151 (Rare, about under $1).

The collector number printed at the bottom of the card is the reliable way to tell them apart.

It's roughly a wash: with a 11% PSA 10 gem rate and current graded prices, grading a near-mint Nidoking (45/114) is estimated to come out within about $10 of selling it raw (est.); grade for protection or display, not profit.

Assumes ~$25/card bulk-rate grading (standard service costs more); ignores turnaround time, sub-9 grades, and shipping. A screen, not a promise.

Nidoking (45/114) is a Rare. PSA has graded 53 copies to date, so graded supply is measurable and growing.

Of the 53 copies PSA has graded, 11% earned a PSA 10. That's a low gem rate, so flawless copies are genuinely hard to come by. Grade-by-grade population and pop-over-time appear with Riffle premium.