Eleven dollars to see the Mariners host the Cardinals in Seattle? That’s the early floor for the Sept. 10, 2025 matchup at T-Mobile Park. Official team sites and secondary markets like Vivid Seats, StubHub, and SeatGeek are listing strong demand. The club uses digital-only entry, limits transactions, and polices bulk resale. A Homestretch Flex Plan offers $500 to spread across remaining games with postseason presale perks.