HomeDepot - EveryDrop Ice & Water Refrigerator Filter 4 EDR4RXD1B - $26.55 after PM (regular $59.99)
You can price match at HomeDepot for $26.55 with price beat. This is a great price as it's normally $59.99
Stock up on them because according to the Whirlpool site they do not expire. Use ebates to get an extra 1%. Place order first and then have the chat rep price match afterwards.
These are OEM filters for Whirlpool, Maytag, KitchenAid, Amana
*Note, these are available at Lowes. However, they advised they will only price match Rona as they own them.