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Vynix US via Amazon [amazon.com] has Vynix 3D Contoured Sleep Mask w/ Memory Foam (Black) on sale for $8.99 – $4.50 off when you apply promo code P3DMZRN6 at checkout = $4.49. Shipping is free w/ Prime or on orders $35+.

Note: Amazon promo codes don’t always apply seamlessly. If you run into this issue, try refreshing the page, re-entering the code, or checking after you select a payment method to confirm whether it already applied.