Homeideas direct via Amazon [amazon.com] has 6-Pack Homeideas Waterproof Pillow Protectors w/ Zipper (2 sizes) on sale from $14.97 when you apply 50% off promo code 50FEHHDH at checkout. Shipping is free w/ Prime or on orders $35+.

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Available:

• 6-Pack Standard [amazon.com] $14.97
• 6-Pack King [amazon.com] $17.97