Professor Oak's New Theory 101/123

HeartGold SoulSilver • Uncommon • Normal

All 17 printings from $0.40 →

No sales in the last 7 days

$0.71as of Oct 31, 2026↑ $0.00 (+0.0%) this week

Buy on eBay or TCGplayer

We may earn a commission on these links, at no cost to you.

Add to portfolio

Sales & Velocity

As of 2026-10-31

Not enough recent sales to judge listings

Sold (7d / 30d)

18 / 72

NM sold between (7d)

—

Cheapest listing

$0.25

Units sold per day, Aug 13–Oct 24 (Near Mint)

Units sold per day, Near Mint
Date	Units sold	Sold between
Aug 13	2	$0.50–$0.80
Aug 26	1	$0.47–$0.47
Aug 28	1	$0.60–$0.60
Sep 2	2	$0.80–$0.80
Sep 8	1	$0.47–$0.47
Sep 11	1	$0.83–$0.83
Sep 28	1	$0.75–$0.75
Oct 12	1	$1.13–$1.13
Oct 14	1	$0.48–$0.48
Oct 15	1	$0.46–$0.46
Oct 20	1	$0.50–$0.50
Oct 23	2	$0.46–$0.72
Oct 24	1	$0.89–$0.89

Condition	Sold 7d	Sold 30d
Damaged	5	8
Heavily Played	5	10
Lightly Played	5	23
Moderately Played	3	24
Near Mint	0	7

Sales data: TCGplayer

Quick answers

How much is Professor Oak's New Theory 101/123 worth?

As of October 31, 2026, Professor Oak's New Theory 101/123 from HeartGold SoulSilver has a TCGplayer market price of $0.71.

Is Professor Oak's New Theory 101/123 going up or down in price?

Its TCGplayer market price is down 5.3% over the past 30 days and flat over the past week, as of October 31, 2026.

How can I track the price of Professor Oak's New Theory 101/123?

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

$0.71

Low

$0.25

Mid

$0.71

High

$20.00

7-Day:$0.00 (+0.0%)

30-Day:-$0.04 (-5.3%)

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%	$0.36	Cash buylist, low end
60%	$0.43	Cash buylist, typical
70%	$0.50	Buylist top end, store credit
80%	$0.57	Bulk lot or quick sale
90%	$0.64	Quick sale, just under market
100%	$0.71	Market price
110%	$0.78	Asking price, room to negotiate
120%	$0.85	Asking price, room to negotiate
150%	$1.07	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 Pokémon · 0 HP · Supporter

Shuffle your hand into your deck. Then, draw 6 cards.

You can play only one Supporter each turn. When you play this card, put it next to your Active Pokemon. When your turn ends, discard this card.

Where to Buy

TCGPlayerRaw$0.71Raw copies, condition graded by the marketplace

Buy Now

eBayRaw listings

Raw listings

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