Just check coupons out (with price alert and history). You probably want to know what is the best price?
Speed regulation mode Stepless speed change, Cutting depth 100mm, Cutting depth 2mm, Cutting depth 100mm, Size 30×13.5cm / 11.8×5.3in, Stroke length 10mm, Battery type Suitable for Makita 18V battery, Color Black, Scope of application Sawing wood / metal plastic / etc., No-load speed 0-3000rpm / 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):
Banggood
Banggood warehouse is located in Europe 
. Coupons for 18V Cordless Electric Reciprocating Saw [EU]? Nope, there’re no coupons in Banggood. Sorry, but there’s no price history in my database.
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
Price history and price alert
There is only one database record (it was for $14.99), 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)).