The ex era binders a lot of collectors treated as a slow and affordable project just got a lot more expensive. The Delta Species era sets printed Pokemon in types they were never supposed to have and stamped the reverse holos with the set symbol and for years the singles sat at prices a patient collector could chip away at a few at a time. Tracking data published this week says that window has closed fast. In the space of three months a dozen cards in the first Delta Species set more than doubled and the biggest names in the era now carry four figure prices.

What the three month numbers show

The figures come from Collectr data published by TheGamer on November 4 and they compare August 4 with November 4. In the 2005 Delta Species set itself 12 cards more than doubled with an average rise of 177 percent across those 12. Bought together in early August the 12 would have cost $3,916 and the same group now totals $10,576. The names at the top are the ones collectors would guess first. The Gold Star Groudon leads the set and the stamped reverse Mewtwo and the stamped reverse Umbreon both sit above $1,000 while the stamped reverse Rayquaza and the Flareon ex are not far behind them.

The cross check against live market prices

We checked the headline cards against TCGplayer market prices tracked independently and the two pictures line up. The Gold Star Groudon sits at $3,000 in the TCGplayer market data as of November 4, up from $1,010 in August. The stamped reverse Mewtwo sits at $1,050 and the stamped reverse Umbreon sits at $1,042.50 and the Flareon ex sits at $464.42 and each of those matches the November figure in the Collectr data. The same tracker puts the cost of one copy of every card in the set at $16,443.72 across the 113 cards it can price. Market prices are estimates built from recorded sales rather than a promise of what any single copy will sell for and condition moves a vintage card a long way in either direction.

Holon Phantoms moved even harder

The same Collectr data set gives Holon Phantoms the biggest move of the four era sets. Another 12 cards there more than doubled and that group rose from $3,167 in August to $11,930 in November. The stamped reverse Gyarados is the single largest percentage jump in the whole report at 396 percent, rising from $349.99 to $1,735.95, and the Gold Star Gyarados in that set is reported at $5,173.54 after sitting at $1,200 in August. A sealed Holon Phantoms booster pack now carries a TCGplayer market price of $1,901.99, which tells the same story from the sealed side. The two later era sets are moving more gently for now. The report counts eight doublers in ex Crystal Guardians and seven in ex Dragon Frontiers and those groups rose from $219 to $529 and from $1,016 to $2,965.

Why this era and why now

One driver named in the reporting is supply at the top end. These sets were printed in an era when grading was far less common than it is today so the pool of top grade copies is small and demand for clean raw copies that might grade well pulls the price of every good single upward. It may also be no accident that this surge is landing in the very week a new set with Delta in its name reaches shelves, because the word is in front of every collector in the hobby right now. That timing link is our read of the moment rather than a proven cause and the honest summary is that vintage supply is fixed while attention is not.

What it means if you collect this era

If you already own these cards the practical move is to look at what is actually in your binder before you buy anything, because a stamped reverse you filed away as a small card may now be one of the more valuable singles you own. If you are buying, slow down. Prices that double in a quarter can also fall back and the gap between a market estimate and a real sold price matters most exactly when a market is moving this fast. Check recent sold prices copy by copy, pay close attention to condition, and treat any seller asking well above the tracked market as a reason to walk away rather than a reason to hurry.

What to watch next

What to watch next is whether these levels hold once launch week attention moves on. A price that survives a quiet month is a new level and a price that fades with the headlines was a spike. The sealed side is worth watching too, because a pack price near $1,901.99 only makes sense while buyers believe the singles inside keep climbing. We will keep an eye on the era sets in our Set Archive as the next round of market data lands.