Amazon offers HydroTools by Swimline Protective Pool Ladder Mat and Pool Step Pad for $12.99 . Eligible for free super saver shipping.

Product Description:
Protect your liner for scratches made by your ladder with this Hydro Tool Swimline 9 x 30-inch floor protective mat. The protective mat eliminates scratching and chaffing caused by ladder. It as a cushion between ladder base and pool liner and protects pool liner from damage caused by ladder base. Great for inflatables, above-ground or in-ground swimming pools!