Costco

Costco.com requires an active membership to check out — that's the one thing to confirm before anything else.

Before a drop

• Confirm your membership is active and you're signed in — don't find out mid-checkout.
• Save payment and shipping details ahead of time.

During checkout

• Sealed TCG product at Costco can sell out fast even without an obvious external announcement — Costco doesn't always promote a restock the way other retailers do.
• Costco enforces its own per-account purchase limits on high-demand items — check the product page for the actual limit rather than assuming.