Driver unit: 50mm, Frequency response: 15-20KHz, Impedance: 32ohms, Package Contents: 1x EACH G9000 3.5mm USB Gaming Headset, 1x English and Chinese User Manual.
Go down and check coupons out. Remember to check price history if it is available. 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 and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($30.73): BGBFAFF2019
2. ($30.73): AFfbG10
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): e2bcea, TTxBG10, 2019SPEDM, BG3CSUM
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – KOTION EACH G9000 Gaming Headset Red ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for KOTION EACH G9000 Gaming Headset Blue. The lowest price was: $17.72.
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)).