Amazon has Dewalt Oscillating Tool Sanding Pad (DWA4200) on sale for $4.19 when you checkout via Subscribe & Save. Shipping is free. Thanks mrjizzo
Note, you may cancel your Subscribe & Save subscription any time after your order ships. Select the later date from the "First Delivery On" menu to get traditional S&S checkout instead of adding to your cart.
Tyler Tool also has Dewalt Oscillating Tool Sanding Pad (DWA4200) on sale for $4.19. Shipping is free.