The replacement heavy duty loop pads are $8.98 for the 2 pack.
Here’s a helpful tutorial on how to replace the worn pad with a new replacement:
How to replace the heavy duty loop pad on your carbide disc:
And while we are about it - two additional helpful DS5 videos…
Why and How - to upgrade your sander to the heavy duty hook & loop system that came with your carbide disc:
How to remove your carbide disc without bending it: