This Bed

OverStock.com has the Blue 8-inch Memory Foam Full Mattress $352.94 after $10 off $175 coupon.

Product description from OverStock.com:

• Adds a touch of luxurious comfort and style to your child’s room or guest room
• Highlighted by a vibrant blue shade
• Hypoallergenic cover, easily removable and washable
• Mattress responds!
  to body heat and weight for maximum comfort
• Memory Foam developed by NASA
• Relives pressure while sleeping
• Full-size measures 74 inches long x 54 inches wide
• Memory Foam is resistant to dust mites and is naturally antimicrobial

Materials:

• Layer 1: removable and washable velour fabric cover
• Layer 2: 2-inch thick layer of 3-pound density NASA developed, hypoallergenic, pressure relieving Memory Foam
• Layer 3: 6-inch thick base layer of traditional 1.8-pound density foam
• Layer 4: PVC bottom cover

Box spring, and bedding (comforter, sheets, pillows, etc.) are NOT included.

Product link.