Aliexpress
Click here… to search for HiBREW AC-507K Coffee Machine on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (70.69 USD): BG1111KA
(CouponsFromChina.com tip: just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGJJNKFJP, BGHome15%, BGZZKFJP, BGHOMEAPP13, BGHOMEA13, 7d18f7, 13f142, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BGYY001, BANGGOODSD
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for HiBREW AC-507K Coffee Machine is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).