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POLRAI DIRECT via Amazon [amazon.com] has 4-Pack Magnetic Cup Holder for Refrigerator w/ Lid Hook & Straw Holder on sale for $24.99 – 50% off when you apply promo code IRS5YT7C at checkout = $12.49. 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.