For the bed, you can purchase reusable waterproof mattress pads that have cotton or flannel on one side and vinyl backing on the other to keep the mattress dry. To protect the sofa and chair, look for washable waterproof pads that come in different colors and patterns to complement the upholstery.
If you do an Internet search for incontinence supplies, you should be able to find what you need. You can order products through the mail, purchase them at local drug stores, or find a medical supply store in the yellow pages.
If you'd like to contact an incontinence supply dealer, the National Association for Continence has a hotline to help you find one. And their telephone number is easy to remember: 800-BLADDER (252-3337).