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Professor Oak's New Theory - 101/123 (League Promo)
Promo · #101/123
Professor Oak's New Theory - 101/123 (League Promo) #101/123 (League & Championship Cards) is worth about $49.95 today, the Near Mint market price from TCGplayer sales as of 2026-10-03.
price trend and all-time high: more ↓less ↑
Professor Oak's New Theory - 101/123 (League Promo) #101/123 is holding steady: $49.95 today, flat over 30 days and at its all-time high (2026-09-04). TCGplayer market price as of 2026-10-03, tracked daily since 2024-02-08. chart →
Price data for your app or store: API and daily history since 2024 · CSV download
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WORTH GRADING?
Grading Professor Oak's New Theory - 101/123 #101/123 pays only if you expect a 10: PSA 10 copies list from $405 on eBay vs $49.95 raw, and after a $25 grading fee, $10 shipping and 13% selling fees you need about a 12% chance of a 10 to break even. run your own numbers →
WHERE TO BUY AND SELL
Reverse Holofoil · eBay scanned 22d agoBuy-side estimate
$30.44
THINa patient buyer pays about $30.44 delivered, from live asks, not sales
show the work →
eBay scan is stale
| TCGplayer market | $32.50 | verify ↗ |
| TCGplayer lowest ask | $32.00 | |
| eBay delivered floor (scanned 22d ago) | $30.44 | the listing ↗ |
Formula: TCGplayer market, clamped between the cheapest real ask anywhere ($30.44) and the eBay floor ($30.44). 5 live ask(s) used.
Floors are the median of the three lowest clean asks. Marketplace links may earn TickerMint a commission; it never affects the numbers.
The verdict · premium
Cards 15-40% off their high after a month down 25% or more were higher 90 days later 58% of the time in our archive since 2024 (938 cases).
The median move, the verdict and the grade-worthy math: try Premium free for 7 days →GAME DATA[ + ] SHOW[ × ] HIDE
- CARD TYPE
- Supporter
- CARD TEXT
- You can only play 1 Supporter card each turn. When you play this card, put it next to your Active Pokémon. When your turn ends, discard this card. Shuffle your hand into your deck. Then, draw 6 cards.
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PRICE FAQ
What would a card shop pay for Professor Oak's New Theory - 101/123 (League Promo)?
+×
Shops and show vendors commonly offer about 70% of market in cash and 80% in store credit. At today's $32.50 market price that is roughly $23 cash or $26 trade for a near-mint copy. Selling it yourself on TCGplayer or eBay nets more after fees; see the seller-net answer below.
What is Professor Oak's New Theory - 101/123 (League Promo) (League & Championship Cards) worth today?
+×
Professor Oak's New Theory - 101/123 (League Promo) [Reverse Holofoil] has a TCGplayer market price of $32.50 as of 2026-10-02.
Is Professor Oak's New Theory - 101/123 (League Promo) going up or down in price?
+×
Professor Oak's New Theory - 101/123 (League Promo) #101/123 is holding steady: $49.95 today, flat over 30 days and at its all-time high (2026-09-04). TCGplayer market price as of 2026-10-03, tracked daily since 2024-02-08.
What is the all-time high price for Professor Oak's New Theory - 101/123 (League Promo)?
+×
The Near Mint price, the one quoted at the top of this page, peaked at $49.95 (2026-09-04). In TickerMint's daily data (since February 2024), the TCGplayer market price for Professor Oak's New Theory - 101/123 (League Promo) [Reverse Holofoil] (all conditions) peaked at $49.95 (2026-03-07) and bottomed at $13.00 (2025-07-18).
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