I have checked all old coupons and price is $5.49 for 100 LED Solar Power Waterproof IP65 PIR Motion Sensor Light (in Banggood). Check coupons or create price alert down below. What is the best price?
Battery Power: 1200Mah, Wattage: 1W, Voltage: 5.5V, Material: PC+ABS, LED Quantity: 100pcs 2835SMD 0.2W/PCS, Sensor Distance: 3-5m, Color: Black
Latest price update (UTC time):
Banggood ($5.49)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). Is it good price? It’s a good price, isn’t it? The average is $6.22.
Link: Banggood product page
Price: $5.49
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG589b2e, BG0f3159, BG7097d7, BG80e7be, BG60ff9a
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for 100 LED Solar Power Waterproof IP65 PIR Motion Sensor Light.
Price records source(s): Banggood
Click on image to enlarge. 
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)).