Whirlpool 4396710 PUR Water Filter

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$32.95 at filter-outlet.com
$36.20 at FiltersFast
$34.99 at AbsoluteHome
Amana WF40 Refrigerator Water Filter

Featured Stores:
$38.70 at The Ignitor Store
$38.70 at Trash-Compactor-Bags.com
$36.95 at FiltersFast
Aquafresh WF285 replaces 4396508, 4396510

The Aquafresh WF285 can be used as a replacement for Whirlpool and Kitchenaid part numbers 439825... Buy it:
$25.95 at FiltersFast