Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
Battery Capacity: 2130 mAh, Working Time: 61 to 120 min
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Price history and price alert
Price history (for all/most countries) for iRobot Roomba 664 Vacuum Cleaning Robot Chinese is here.
Price records source(s): Gearbest
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)).