Just check coupons out (with price alert and history). Do you want to know what the best price is?
Material: Stainless Steel, Ultrasonic Frequency: 40KHZ, Heating Power: 500W, Inner Tank Size: 500*300*200mm, Ultrasonic Power: 600W Adjustable, Outer Packing Size: 635*410*390mm, Capacity: 30L, Working Voltage: 110/220V, Net Weight/Gross Weight: 14.4/16kg, Dimensions: 585*327*333mm
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.
Link: Banggood product page
1. ($527.39): Terence
2. ($533.06): BG00c906
you should apply the coupon in your cart 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): BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, 7bcdf9, BGHONEY2110, BGOxy10, 00c906, ADMITAD2212, 2022ACTIESNL
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for SKYMEN 100S 30L Ultrasonic Cleaner.
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)).