Just check coupons out (with price alert and history). What is best price?
Middle Button, Connection: USB Wired, Material: ABS+Rubber, Right, Dimension(LWH): 123.45*65.77*39.30mm, Tracking Method: Optical, Resolution: 500-750(Default)-1000-1500-2000-3500DPI, Weight: 135± 10g (Cable Included), Polling Rate: 125-250-500(Default)-1000Hz, Backward, Acceleration: 20g, Image Processing: 5300FPS, DPI+, SPI Sampling: 2ms, Forward, Maximum Speed: 80IPS, DPI-), Cable Length: 1.8M, Sensor: Avago PMW3320, Buttons: 7-Button(Left, Color: Black
Aliexpress
I could not find it 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 China. There is one great coupon!
Link: Banggood product page
1. ($17.99): 13f142
apply code in your basket (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): 215c65, f3e3a0, 502C6B, TTxBG10, e18b44, BGe28b38, AFfbG10
(probably won’t work, but you can try them out)
Price history and price alert
Do you need price history chart (for all/most countries) for MantisTek GM2 3500DPI Mouse? There we go.
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)).