Onix

Onix (109/214), the Common from Lost Thunder, has an estimated ungraded market price of about $2–$3. Note: 25 other cards named Onix exist across the sets Riffle tracks, at very different values; check the collector number.

This page covers Onix (109/214), the Common (about $2–$3) from Lost Thunder.

The other versions: #84/110 from Legendary Collection (Common, about $115–$150); #98/147 from Aquapolis (Common, about $65–$85); #3/18 from Southern Islands (Common, about $45–$60); #69/109 from Team Rocket Returns (Common, about $35–$45); #65/115 from Unseen Forces (Common, about $28–$37); #71/100 from Sandstorm (Common, about $16–$21); #42/112 from FireRed & LeafGreen (Uncommon, about $16–$21); #92/130 from Diamond & Pearl (Common, about $9–$12); #56/95 from Unleashed (Common, about $5–$7); #69/111 from Neo Genesis (Common, about $2–$4); #61/116 from Plasma Freeze (Uncommon, about $2–$4); #69/100 from Stormfront (Common, about $2–$3); #57/95 from Unleashed (Common, about $1–$2); #095/165 from 151 (Uncommon, about $1–$2); #84/130 from Base Set 2 (Common, about $0.90–$1); #56/102 from Base Set (Common, about under $1); #61/108 from Evolutions (Common, about under $1); #71/168 from Celestial Storm (Common, about under $1); #105/236 from Cosmic Eclipse (Common, about under $1); #036/78 from Pokémon GO (Common, about under $1); #103/236 from Unified Minds (Common, about under $1); #68/163 from Battle Styles (Common, about under $1); #070/132 from Mega Evolution (Common, about under $1); #138/264 from Fusion Strike (Common, about under $1); #090/182 from Paradox Rift (Common, about under $1).

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