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Darkness Beam via Amazon [amazon.com] has DARKBEAM 365nm UV Rechargeable Black Light Flashlight for $12.99 – $5.85 off when you apply promo code YMPR46MT at checkout = $7.14. Shipping is free with Prime or on $35+ orders.

Note: Amazon promo codes don’t always apply seamlessly. If you run into this issue, refresh the page, re-enter the code, or revisit the cart page.