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The Greedy Report: One Piece TCG Koby Promo Crashed From $600 to $184

Published October 12, 2026 · Greedy TCG

> Quick answer: The Koby Treasure Cup promo fell from $599.90 to $184.37 in 7 days, a 69% drop. In the same week, Marco (SP) Anime 25th Collection rose 45% to $1,500.00, and CS 2023 Luffy climbed 28% to $1,335.00.

If you flip One Piece cards, check your binder now. Several high-end cards moved hard over the last 7 days. Some made big gains. Two promos took heavy losses.

Here is the full breakdown, with market prices from the start and end of that 7-day window.

How much did the Koby Treasure Cup promo drop?

The Koby Treasure Cup promo had the worst week on this list. Its market price went from $599.90 to $184.37. That is a 69% drop in just 7 days.

If you bought near the top, you are holding a card that lost more than two-thirds of its market price in a week. If you were planning to sell, the price you had in your head is no longer the price the market shows.

This is the card that hurts. It is also the clearest reminder that promo prices can reset fast.

Why did the Jozu Championship 2023 promo fall?

Koby was not the only promo to slide. The Jozu Championship 2023 promo fell from $331.24 to $188.12 in 7 days. That is a 43% drop.

We will not guess at the cause. The numbers alone tell the story for anyone holding it: the market price fell by almost half in one week. Now Jozu and Koby sit at nearly the same level, around $184 to $188.

If you own either card, check current sold listings before you list or buy more. Do not rely on a price you saw last week.

Which One Piece cards went up in price this week?

Four cards on our list climbed over the same 7 days.

Marco (SP) Anime 25th Collection led the gains. Its market price went from $1,034.16 to $1,500.00. That is up 45%.

Monkey.D.Luffy CS 2023 Event Pack rose from $1,040.83 to $1,335.00. That is up 28%.

Marshall.D.Teach Online Regional 2023 Finalist climbed from $137.53 to $199.99. That is up 45%, matching Marco's percentage gain at a much lower price point.

Roronoa Zoro (Manga) Premium Booster -The Best- moved from $2,150 to $2,350. That is up 9%. It is the smallest percentage gain here, but it is still the most expensive card on the list.

Is Marco SP from Anime 25th worth $1,500 now?

Marco's market price hit $1,500.00 at the end of the 7-day window. That is a jump of more than $465 from $1,034.16.

Whether it is "worth" that depends on what you plan to do. If you are selling, a 45% weekly gain is a strong moment to compare offers. If you are buying, know that you are paying after a big run-up, not before it.

The same goes for Teach. A 45% move on a card that ended at $199.99 can catch a lot of collectors off guard.

What should One Piece TCG flippers do after a big price swing?

This week shows both sides of the market. Two cards dropped 43% and 69%. Four cards rose between 9% and 45%.

A few simple habits help:

Check your binder often. Prices on high-end cards can move hundreds of dollars in a week.
Use recent sold data. A listing price is not a sale price. Check what cards actually sold for.
Do not chase one week. A 45% jump or a 69% drop is one data point. Watch the trend before you act.
Know your exit price. Decide what you would sell for before the market decides for you.

If you want to learn how to read these swings and flip smarter, join our free trainings at greedytcg.com/academy. And follow The Greedy Report for the next weekly breakdown.