After a little research, I found a local store that sold organic wool puddle pads (they also have a website with an extensive selection of natural bedding and supplies). I bought the "Changer" size (22" x 31"), partly because of cost and partly because of ease of care. I took it home with me, happy as could be to have found a natural, local product. For placing it on the bed, I played with a couple options, but ended up laying it parallel to my pillow and down a few inches (right where Goen's bottom would be). Then I put a twin sheet folded in half over it so the itchy wool would not bother us. Now when there is a leak, all I have to do is fold the wool puddle pad and sheet in half and set it aside for morning when I put it outside in the direct sun for the day. It has been helpful several times for its intended purpose. I have not had problems with leaking through the wool, despite a few prolific pee nights. So it has met its other intended purpose: reducing my anxiety around ruining the mattress and having to do loads of laundry.
For more information on the wool puddle pads, or to order one for yourself, you can go here. The brick and mortar stores are in San Rafael, California, and San Francisco.