Lenovo Thinkplus BH4 bluetooth Earphone Single Earhook HiFi Stereo Dual Mic Noise Reduction HD Calls 180° Rotary Ergonomic 130mAh Battery Earhooks In-ear Headphone with Mic.
Basically copy coupon, view price history or create e-mail price alert. You probably want to know 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 and price update (UTC):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
1. ($15.45): BGAudio9
paste coupon code in your cart and click Apply 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): BGAudio3
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for Lenovo Thinkplus BH4 Business Earphone. The lowest price was: $12.38.
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)).