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XEITIN via Amazon [amazon.com] has XEITIN 150 PSI Portable Tire Inflator Air Compressor w/ 6000mAh Battery, 12V DC Adapter & LCD Display on sale for $29.99 – 50% off when you apply promo code CMUIWRSQ at checkout = $14.99. 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.