Biggest fallers over the last 90 days, by TCGplayer median. Historical movement — not investment advice.
28 cards priced ≥ $100.

Zapdos ex
151

Charmander
151

Mega Lucario ex
Mega Evolution

Blastoise ex
151

Venusaur ex
151

Mega Charizard X ex
Phantasmal Flames

Lusamine
Ultra Prism
Mega Meganium ex
Ascended Heroes

Champions Festival
Sun & Moon Black Star Promos

Squirtle
151

Champions Festival
Sun & Moon Black Star Promos

Charizard-GX
Burning Shadows

Blaziken VMAX
Chilling Reign

Paradise Resort
Scarlet & Violet Black Star Promos
Lillie's Clefairy ex
Ascended Heroes

Champions Festival
Sun & Moon Black Star Promos
Mega Dragonite ex
Ascended Heroes

Cynthia
Ultra Prism

Paradise Resort
Scarlet & Violet Black Star Promos

Ceruledge ex
Prismatic Evolutions

Mega Gardevoir ex
Mega Evolution

Latias ex
Surging Sparks

Lillie
Ultra Prism

Charizard ex
151

Espeon VMAX
Fusion Strike

Special Delivery Bidoof
SWSH Black Star Promos

Espeon V
Evolving Skies

Umbreon-GX
Sun & Moon