365nm 3-LED UV Black Light Flashlight w/ USB-C Rechargeable & LCD Display $9.99 + Free Shipping w/ Prime or on $35+

Dokhbem US via Amazon [amazon.com] has 365nm 3-LED UV Black Light Flashlight w/ USB-C Rechargeable & LCD Display on sale for $19.98 - extra 50% off when you apply promo code PFBYDDWY at checkout = $9.99. Shipping is free w/ Prime or on orders $35+.

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From Merchant's Product Page:

• Specs:
  • Wavelength: 365nm
  • Light source: 3x UV LED chips
  • Power source: USB-C rechargeable (1x AAA battery included)
  • Charge time: ~3 hours
  • Material: Aluminum alloy
  • Water resistance: Water resistant
  • Dimensions: 1.1" x 0.98" x 4.84"
  • Model: DB003
• Includes:
  • UV black light flashlight
  • USB-C charging cable
  • User manual
• Features:
  • LCD display shows remaining battery level
  • Green indicator light confirms charging is active
  • Focusable beam
  • Impact resistant construction
  • Applications: pet urine detection, scorpion hunting, mineral/rockhound detection, resin curing, currency verification, glow parties