Where can I buy two Pike Street standard fleece pillowcases in Hunter green?

I've ordered a full sheet set, but need two extra pillowcases.

Product Description
Color: Plum | Size: King
Amazon.com Product Description
Pike Street's lightweight and fluffy fleece sheets give the feeling of sleeping on a favorite blanket. Their pilling resistance allows for a more radiant look and a soft, supple feel against the skin. Offered in four sizes and five versatile, solid colors, the sheet sets accessorize easily and can be used to outfit any bed in the house. This king set includes one 106-by-102-inch flat sheet, two king 20-by-40-inch pillowcases, and one 78-by-80-inch fitted sheet. The fitted sheet has deep, 14-inch corners to fit mattresses up to 16 inches thick. Expertly made from 100 percent polyester fleece for today's easy-care lifestyles, the sheets are safe to clean at home in the washer and dryer.

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