We found this at seven stores including Wayfair, Target, and Bed Bath & Beyond. This product sells from $27.12 up to $73.99. Users can save 63% by shopping at Walmart.

This is the lowest price we've seen, typically ranging from $39 to $63.

This product is also marketed as the 

Patio Bench Cushion at Wayfair

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54" x 18" x 3" Duck Covers Weekend Water-Resistant Outdoor Bench Cushion Cedarwood - Classic Accessories: Zippered, Polyurethane Foam Fill at Target

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Duck Covers Weekend Water-Resistant Outdoor Bench Cushion, 54 x 18 x 3 inch, Cedarwood at Walmart

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Duck Covers Weekend 54 in. W x 18 in. D x 3 in. Thick Rectangular Outdoor Bench Cushion in Cedarwood at Home Depot

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Duck Covers Weekend Water-Resistant Outdoor Bench Cushion, 54 x 18 x 3 Inch, Cedarwood, Patio Furniture Cushions at Amazon

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