AstroAI Direct via Amazon has AstroAI Digital Tire Pressure Gauge w/ AAA Batteries (up to 150 PSI) on sale for $7.99 - $4 (redeem coupon on the item page or apply promo code Z6EY8KHX at checkout) = $3.99. Shipping is free with Prime or on $35+ orders.

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Thanks to Deal Editor iconian for finding this deal.