What I've started doing is layering them. (when they get older.) So I put down puppy pad, then some shavings, the puppy pad, then some shavings. So when I pull up puppy pad off the top, the bottom is ready to go.
But as they get older you will really go through those pads. In fact, you'll wonder if it's really even worth it, rather than just scooping out the wood chips.
BTW: Cute duckies!