Aliexpress
Click here… to search for BOYA BY-PM300 Professional Desktop USB Microphone on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (67.61 USD): BGSaleFeb8
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): BG11f04e, BGBuscape01, BGc5874d, BGBRPL2, BGHOTSHOP15, BG53e9c8, BGAlerabatKL, BGd173b4, BGAUDIO, BG9ba0e8, BG1b5830
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for BOYA BY-PM300 Professional Desktop USB Microphone is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).