Water pressure: 2.2Mpa, Battery: 2500mahx 5 (included), Maximum inlet pressure: 0.5Mpa, Fast charge: 21V 1A, Rated pressure: high-grade 2.2Mpa energy-saving file: 0.8Mpa, Charging time: 2.5H, Water pipe length 6 meters, Rated flow rate: 3L/min, Flow rate: 180L/h, Material: PC + silicone + metal.
Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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 coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($159.99): BGJM159
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Price history and price alert
Here is price history (for all/most countries) for Jimmy JW31 Handheld Flush Gun. The lowest price was: $132.59.
Price records source(s): Gearbest, 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)).