You can create price alert here, copy coupons and view price history. Best price?
Solar panel power: 5.5V 0.55W, , Lithium battery: 3.7V-1200mAh, , LED: 12 SMD LED, , Sensing Distance: 120ºand 3m, , Delay Time: 10 seconds, , Charging Time: 8 hours
Aliexpress
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Here are coupons that you can use.
Latest coupon and price update (UTC):
Price history and price alert
There is only one database record (it was for $8.99), so you can’t see price history chart.
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).