Go down and check coupons out. Remember to check price history if it is available. Best price?
Flow Rate: 5L/Min to 35l/Min, Size: 155*68*117cm, Operating water pressure 0.5bar to 8bar (7-116PSI), 3 irrigation plans per day, Powered by 2xAAAbatteries(not included), Brand: RAINPOINT, 1″ or 3/4″inlet thread and 3/4″ outlet thread, Unit Weight: 390g, Watering Duration from 1min to 11h59min, IP X4 water proof, Manually watering for 10min, Watering Frequency from every 1 day to every 7 days or any day from Monday to Sunday
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG46ab76, Cuponation9, BG1379ea, BG8460a1, BG60e8b8, BGc99e95, BGb2dc15, BG357e45, BG8ReviTrage, BGGutscheine, BG00c906, BG8OFFCOUPON, TTBLACK5, BGdbe184, BG589b2e, BGf625a4, BG23ALEAprD, BG081591
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for RAINPOINT Sprinkler Water Timer.
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)).