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Amazon has 300 LED daylight white strip lights [amazon.com] with UL listed 12V 2A power adapter and knob dimmer for $ 12.99 when you apply promo code at checkout.

Coupon code: 523ZWG88 ($ 19.99 – $ 7 = $ 12.99)

Package includes:
1 x 5m/16.4ft 300 LED Daylight White Strip
1 x Knob Dimmer
1 x 12V, 2A UL Listed Power Supply