Mastemon (BT-21: Illustration Celebration Pack) World Convergence Promo Digimon card — value and price

Mastemon (BT-21: Illustration Celebration Pack)

World Convergence · Promo
Digimon dgm:621098 TCGplayer (daily snapshot, 2026-07-24)
Fair market value
$6.04
Consensus of 1 market price guide. Typical $4.93 – $7.18.
▼ 13% · 35d
Sources: TCGplayer (daily snapshot, 2026-07-24) · Near Mint, raw
Optimal buy
$5.53
Never pay above $5.81
Optimal sell
$6.38
Never sell below $6.14
Buy this card · aim to pay under $5.81
Find on eBay → TCGplayer → Buy on Amazon → Graded (PSA 10) →

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Selling this card
Optimal sell $6.38 · never below $6.14. Value your copy for the live net-after-fees calculator.
Where to sell
eBay~13.25% + $0.30Largest audience; on any listing use “Sell one like this” to prefill yours.TCGplayer~10–11%Best for singles; buyers expect competitive, data-driven pricing.Whatnot~8% + paymentLive-auction app; strong for breaks, lots, and fast sales.
Shipping & protection supplies
Low value — a sleeve in a plain/bubble mailer is plenty; tracking optional under ~$20.
Penny sleevesBubble mailers
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Common questions
How much is Mastemon (BT-21: Illustration Celebration Pack) worth?

Mastemon (BT-21: Illustration Celebration Pack) from World Convergence has a fair market value of about $6.04 (Near Mint, raw), based on a consensus of current market price guides.

What is the best price to sell Mastemon (BT-21: Illustration Celebration Pack)?

List around $6.38 to clear without leaving money on the table; that nets about $4.15 after fees and shipping.

What should I pay to buy Mastemon (BT-21: Illustration Celebration Pack)?

A disciplined buy target is about $5.53 — a discount to fair value that keeps an edge. Aim not to pay above $5.81.

Where can I buy Mastemon (BT-21: Illustration Celebration Pack)?

Mastemon (BT-21: Illustration Celebration Pack) is sold on eBay, TCGplayer, and Amazon. Compare live listings against the fair value of $6.04 and aim to pay under $5.81 — SplitShot links you straight to current listings at each marketplace.

Is now a good time to buy Mastemon (BT-21: Illustration Celebration Pack)?

Mastemon (BT-21: Illustration Celebration Pack) is trending stable lately. A disciplined entry is under $5.81; paying near or below $5.53 keeps a margin of safety versus the $6.04 fair value.

Estimate for guidance, not an appraisal. Value your exact copy →