Mattress Firm Montana is the largest retailer of mattresses in Billings! Our locally owned showroom has the best selection of mattresses all under one roof. Our Billings mattress store has top national brands like Tempur-Pedic, Sealy, Stearns & Foster, Purple, Nectar and more. We stock the Tempur-Ergo Smart Base to adjust your sleep position. Statewide home delivery on your new mattress, and free in-home setup!