You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Size (H)40cm/15.75 in, Color Blue, Power Supply Rechargeable Lithium Battery, Guide length 20.5cm/6 in, Speed 2000rpm, Power 600W, Chain Material High Carbon Steel
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 code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. Too bad there’s no coupon right now in Banggood. I don’t know if this is a good price – number of records in my database is too low!
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG931bb3, 13f142
(these coupons are old, so probably won’t work)
Price history and price alert
There is only one database record (it was for $30.59), so you can’t see price history chart.
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)).