We've been hearing a lot about the antibacterial benefits of organic wool. It's easily treated with natural repellents like eucalyptus and chrysanthemum. Seems like the perfect material for hypoallergenic bedding. This set from Gaiam ranges from $69 to $289.
The wool is sheared from organic sheep and infused with a chemical-free mixture of lemon, lavender, and eucalyptus. To care for an organic wool mattress pad, have it dry-cleaned (by a green cleaner) once a year.