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.
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Aliexpress
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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. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($159.99): BGJM159
put item in your cart and apply coupon code there 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
Do you need price history chart (for all/most countries) for Jimmy JW31 Handheld Flush Gun? There we go. 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)).