Bluetooth 4.0, Current: 50mA, Bluetooth Switch, Power: 1 * AA Battery(Not Included.), Forward Button, Right Button, Connection: Bluetooth 3.0, Acceleration: 10G, Resolution: 600-1000-1300-1600DPI, Button: Left Button, Tracking Method: Optical, Dimension: 103.91*65.43*37.29mm, DPI Switch, Tracking Rate: 30inch/s, Weight: 83.2g, Backward Button, Scroll Wheel, Voltage: 1.5V, 2.4GHz Wireless.
Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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 China.
Link: Banggood product page
1. ($16.99): BG569D
2. ($20.38): AFfbG10
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): 502C6B, e18b44, TTxBG10, BG3CSUM
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Rapoo M300 Wireless Mouse is here. The lowest price was: $14.99.
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)).