Professor Oak's New Theory - 101/123 (League Promo) Reverse Holo

League & Championship Cards • Promo • Reverse Holofoil

No sales in the last 7 days

$33.46as of Oct 30, 2026↑ $0.00 (+0.0%) this week

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Selling it? At market it nets about $28.67 on TCGplayer or $28.32 on eBay after fees. Where to sell and the fee calculator →

Sales & Velocity

As of 2026-10-30

Thin market: fewer than 5 sales in the last 7 days

Sold (7d / 30d)

0 / 5

NM sold between (7d)

—

Cheapest listing

$40.00

Condition	Sold 7d	Sold 30d
Lightly Played	0	5
Moderately Played	0	0
Heavily Played	0	0
Near Mint	0	0

Sales data: TCGplayer

Quick answers

How much is Professor Oak's New Theory - 101/123 (League Promo) worth?

As of October 30, 2026, Professor Oak's New Theory - 101/123 (League Promo) from League & Championship Cards has a TCGplayer market price of $33.46.

Is Professor Oak's New Theory - 101/123 (League Promo) going up or down in price?

Its TCGplayer market price is up 3.0% over the past 30 days and flat over the past week, as of October 30, 2026.

How can I track the price of Professor Oak's New Theory - 101/123 (League Promo)?

Set a free price alert on this page: enter your email and a target price, and The Lab TCG emails you when the TCGplayer market price falls to it. Prices are checked every night, and no account is needed.

Price Snapshot

Market

$33.46

Low

$40.00

Mid

$49.50

High

$289.70

7-Day:$0.00 (+0.0%)

30-Day:+$0.96 (+3.0%)

Percent of Market

Buying? See what a price is as a share of market. Selling? Start at market and read down to a buylist offer or up to an asking price.

% of Market price	Price	Usually means
50%	$16.73	Cash buylist, low end
60%	$20.08	Cash buylist, typical
70%	$23.42	Buylist top end, store credit
80%	$26.77	Bulk lot or quick sale
90%	$30.11	Quick sale, just under market
100%	$33.46	Market price
110%	$36.81	Asking price, room to negotiate
120%	$40.15	Asking price, room to negotiate
150%	$50.19	Presale and hype pricing

Your price (USD)

$

Type what you are being asked to pay, or what you plan to list at.

Market price is the TCGplayer market price. TCGplayer Low is the lowest listed near-mint price at the last snapshot. Definitions

Card text

Supporter

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.

Where to Buy

TCGPlayerRaw$33.46Raw copies, condition graded by the marketplace

Buy Now

eBayRaw listings and graded slabs

Raw listings PSA listings

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