Tangrowth

Tangrowth (6/149), the Rare from Boundaries Crossed, has an estimated ungraded market price of about $4–$6. Note: 14 other cards named Tangrowth exist across the sets Riffle tracks, at very different values; check the collector number.

This page covers Tangrowth (6/149), the Rare (about $4–$6) from Boundaries Crossed.

The other versions: #10/106 from Great Encounters (Rare Holo, about $5–$7); #10/99 from Arceus (Rare Holo, about $4–$5); #29/100 from Stormfront (Rare, about $2–$3); #34/95 from Call of Legends (Rare, about $2–$3); #2/113 from Legendary Treasures (Rare, about $0.70–$1); #5/160 from Primal Clash (Rare, about under $1); #17/214 from Unbroken Bonds (Rare, about under $1); #2/214 from Lost Thunder (Rare, about under $1); #2/114 from Steam Siege (Uncommon, about under $1); #6/236 from Cosmic Eclipse (Uncommon, about under $1); #8/147 from Burning Shadows (Rare, about under $1); #005/159 from Crown Zenith (Rare, about under $1); #007/132 from Mega Evolution (Uncommon, about under $1); #002/167 from Twilight Masquerade (Common, about under $1).

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