Amazon.com: Wood Bed Slats Support for Large Bed, Folding Heavy Duty Vertical Bed Boards for Under Mattress, 80/90/100/120/135/150/180/200cm Long (Size : 90x120cm/35.4x47.2in) : Home & Kitchen
Amazon.com: Signature Design by Ashley Wooden Mattress Support Bunkie Board Roll Slat with Nylon Cord, Queen, Beige : Home & Kitchen
Live Edge Bed Frames - Handcrafted in Portland, Oregon | The Joinery
Glance 0.75-in Standard Mattress Support Wooden Bunkie Board/Slats, Queen in the Box Springs department at Lowes.com
Poplar wood slats to support a mattress without a foundation.