Mattress Firm expands DoorDash partnership with campus ambassadorsMattress Firm and DoorDash are recruiting college students to serve as promotional sleep experts. Mattress Firm rolls out two-hour delivery with DoorDashThe nation's largest mattress specialty retailer has a new on-demand delivery partner. Tempur Sealy to acquire Mattress Firm in $4 billion deal A leading bedding maker is set to acquire the nation’s largest mattress specialty retailer.