Ninja Boy

Steam Siege · 103/114 ·Uncommon

Illustration: Megumi Mizutani →

League Promo £3.66 4 sales Normal £1.60 13 sales

Market price

£1.46

Price history · RAW

2026-05-04 · £0.73 £5.33 · 2026-07-28

Cross-market · RAW median per marketplace

Spread vs. cheapest market — before shipping/duty/fees

ebay.es	n=2	£1.31	+54%
ebay.com	n=3	£0.85	—

Price per print

🇬🇧 Normal · EN n=2 £1.46

🇩🇪 Normal · DE 1 sales · too few Last sale £0.85

🇮🇹 Normal · IT 1 sales · too few Last sale £1.06

How is this value calculated?

Ladder estimate · English · ~£1.46 gruen reverse_holo

Evidence path	Sales	Age	Value vᵢ	Weight gᵢ
eigene rohe NM-Verkäufe	5	4 mo	£1.73	40.82
eigene LP-Verkäufe ÷ 0.9306	3	3 mo	£0.44	5.55

value = exp( Σ gᵢ·ln vᵢ ⁄ Σ gᵢ ) = £1.46 · Σ g = 46.37

Measured error for this era×language (backtest): ±19 %

PSA Population EN Σ 9

PSA 10

1 11%

PSA 9

2 22%

PSA 8

1 11%

PSA ≤7

5 56%

PSA + CGC · as of 2026-08-07

Recent sales · 6

2026-07-28	EN	RAW UNKNOWN	2016 Pokemon, XY Steam Siege, #103/114 Ninja Boy, Uncommon ( · eBay	£5.33
2026-07-16	EN	RAW UNKNOWN	Ninja Boy Pokemon Steam Siege card English · eBay	£1.57
2026-07-14	DE	RAW UNKNOWN	Pokemon Card XY Steam Boiler No. 103/114 Ninja Boy German · eBay	£0.85
2026-07-05	EN	RAW MP	Ninja Boy - 103/114 - Uncommon - Moderately Played · eBay	£0.73
2026-05-24	EN	RAW LP	Tarjeta Pokémon Ninja Boy 103/114 Steam Siege regular poco c · eBay	£1.56
2026-05-04	IT	RAW UNKNOWN	NINJA BOY 103/114 Carta AIUTO in Italiano POKEMON Allenatore · eBay	£1.06

Frequently asked questions

How does lastsold determine the market value?

lastsold uses only real sales — eBay plus auction houses like Goldin & Fanatics — recent sales count more (recency weighting), outliers and fakes are removed. It's not an estimate but actual sold prices, separated by condition, language and grading.