Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
Working Time 8 – 10 hours, Battery 1000mAh LI- Battery, Size 7.5x 4.5x 4.2cm / 2.95″x 1.77″x 1.65″, Lumens 100lm, walkways, Shell Color Black, Lighting Angle 150°, etc., Lighting Distance 20m, Solar Panel 2V 80MA Polysilicon, steps, Weight 40g / pc, fences, Quantity 4 pcs, LED Color White Light, Application Outdoor walls, Charging Time 6 – 8 hours (Under Full Sunlight), Color Temperature 3200k, guardrails, Material ABS + Solar Panel, IP Rating IP55, Voltage 1.2V, Light Source 1x F5 Lamp Bead, Working Temperature -10℃ ~ 45℃
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
1. ($15.48): BGLIG12
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGAFF10OFF, bGhOnEy10, BGDGSL6, 20%DG422, BG4PCL8, BGDigoo15%, BGdragonBoat, BGSS10%SW, BGDGASG, BGHome15%, BGHOMEA15%, BgcLuBofErtA10, BGHBHJ105, BGCuponation10, 13f142, BGHONEY2110, BG10OFFAFF, BGwhielabel
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for 4Pcs DIGOO DG-SL612 Outdoor Solar Step Lamp is here.
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)).