Amazon.com: MAXYOYO 2.5" Japanese Floor Mattress Futon Mattress Twin Size, Shikibuton Tatami Mat Floor Bed, Roll Up Foldable Mattress Topper, for Guest Camping RV, : Home & Kitchen
Amazon.co.jp: Futon Mattress, Single, Extra Thick, 3.9 inches (10 cm), High Resilience, Dust Mite Resistant, Bed Mattress, Extra Thick, Peach Skin Treatment, Single, Synthetic Fiber, Three-Layer Construction, Solid Cotton, Firm Support, Antibacterial,
14 Cheap Futons Under $400 That Look *Much* Pricier
Amazon.com: YOSHOOT Grey Feather Futon Floor Mattress for Adults, Japanese Thicken Futon Mattress Foldable Floor Bed Camping Mattress, with Canvas Storage Bag, Grey, Full Size : Home & Kitchen
Filton Futon Bunk Bed (With One Futon Mattress in Various Colours) - Mattress Guru
Kodiak Furniture Linen Full-Size Futon Mattress
Natural Cotton Japanese Futon Mattress | Japan Objects Store