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

League & Championship Cards • Promo • Reverse Holofoil

No sales in the last 7 days

$33.75as of Oct 10, 2026↑ +$1.25 (+3.8%) this week

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Selling it? At market it nets about $28.92 on TCGplayer or $28.57 on eBay after fees. Where to sell and the fee calculator →

Sales & Velocity

As of 2026-10-10

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

Sold (7d / 30d)

4 / 6

NM sold between (7d)

—

Cheapest listing

$32.00

Condition	Sold 7d	Sold 30d
Lightly Played	4	6
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 10, 2026, Professor Oak's New Theory - 101/123 (League Promo) from League & Championship Cards has a TCGplayer market price of $33.75.

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

Its TCGplayer market price is up 3.1% over the past 30 days and up 3.8% over the past week, as of October 10, 2026.

Price Snapshot

Market

$33.75

Low

$32.00

Mid

$44.99

High

$289.82

7-Day:+$1.25 (+3.8%)

30-Day:+$1.00 (+3.1%)

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%	$16.88	Cash buylist, low end
60%	$20.25	Cash buylist, typical
70%	$23.63	Buylist top end, store credit
80%	$27.00	Bulk lot or quick sale
90%	$30.38	Quick sale, just under market
100%	$33.75	Market price
110%	$37.13	Asking price, room to negotiate
120%	$40.50	Asking price, room to negotiate
150%	$50.63	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$33.75Raw copies, condition graded by the marketplace

Buy Now

eBayRaw listings and graded slabs

Raw listings PSA listings

TCGplayer for raw copies (condition is graded by the marketplace, not the seller). eBay for more listings and slabs. Links may earn us a commission at no cost to you.