Mattress Firm offers a wide selection of mattresses from top brands, providing free and fast delivery, financing options, a low price guarantee, and a 120-night sleep trial to ensure customer satisfaction.
Promotions subject to change. See store for details.
Last updated: Mar 31, 2026
Current promotions include up to 60% off during the July 4th Sale, 51% off on select mattresses, $200 Instant Gift with certain purchases, free adjustable bases with select mattresses, 0% APR financing for up to 72 months, and bundle deals like the Sleepy’s Basic Hybrid + Adjustable Base for $499.99. Offers are valid through June 30, 2025, with specific conditions applying to each promotion.
Last updated 2/25/2026
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Last updated: Feb 25, 2026
Address
2111 State Hwy K, O'Fallon, MO 63368
Phone
+1 636-978-0352Website
Visit websiteHours
Mon-Sat: 10AM-8PM, Sun: 10AM-6PM
