Mega Gyarados Collection Box.
Collection Box
updated Oct 16, 2026
updated Oct 16, 2026
Market price$644.46£486.51€5757 day0.0%30 day0.0%Peak, Sep 18, 2026$644.46£486.51€575
Price history, weekly
$644$200
Jul 10, 2025Oct 16, 2026
Is it worth it
$644.46£486.51€575 for the Collection Box, against $480.96£363.08€429.12 to buy all 116 XY - Steam Siege cards as singles. Most of that sits in ten of them, so a box is a bet on those.
The median XY - Steam Siege card has moved -43.4% over three years.
- Ten most valuable cards
- 70% of the set
- Top card, Gardevoir EX (Secret)
- $108.48£81.89€96.79
- Median card
- $0.64£0.48€0.57
- Cards in the set
- 116
- Released
- Aug 3, 2016
- In stock
- no shop we track
What comes out of it
GradeSort116 of 116 · 116 cards · median $0.64£0.48€0.57
XY - Steam Siege · sorted by value
60 of 116 shown
Other sealed from XY - Steam Siege
ProductKind7 dayPrice
Steam Siege Elite Trainer BoxXY - Steam SiegeETB–$1,800£1,359€1,606
Steam Siege Booster BoxXY - Steam SiegeBooster Box+3.8%$1,350£1,019€1,205
Battle Arena Decks: Keldeo EX vs Rayquaza EXXY - Steam SiegeDeck–$192.61£145.40€171.85
Steam Siege Prerelease KitXY - Steam SiegeKit–$160.32£121.03€143.04
Steam Siege Single Pack BlisterXY - Steam Siege · 2 versionsBlister–$64.06£48.36€57.16
XY Steam Siege Sleeved Booster PackXY - Steam Siege2 in stock–$39.45£29.78€35.20
Steam Siege Booster PackXY - Steam Siege1 in stock+3.6%$32.85£24.80€29.31
Steam Siege Theme Deck - "Ring of Lightning" [Hoopa]XY - Steam Siege2 in stock–$22.91£17.29€20.44
Steam Siege Theme Deck - "Gears of Fire" [Volcanion]XY - Steam Siege2 in stock-0.4%$20.06£15.14€17.90What this price is
$644.46£486.51€575 is the TCGplayer market price, the number copies are actually changing hands at rather than what any one shop is asking. It is the same source as the card prices everywhere else on the site, so a box and the cards inside it are measured the same way and can be compared directly.