Frequency range: 10-40000Hz, Earphonesensitivity: 107 dB/mW, Whether with cable: Yes, Earphone interface: MMCX Interface, Brand: TRN, Plug Type: 3.5mm Straight Plug, Cable Length: 1.25m, Whether with mic: Optional, Product Name: TRN TA1 Knowles Metal In Ear Earphone, Earphone type: In-ear, Model: TA1, Color: Silver, Whether can replacement cable: Yes, Impedance: 16 Ω.
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 price update (UTC time):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
1. ($42.20): BGAlerabatKL
apply code in your basket (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): BGCuponation10, BGSK055, BGLOAC1, 13f142, BGa0b145, BGBuscape01, BGBRPL2, BGHOTSHOP15, BG53e9c8
(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 TRN TA1 Knowles BA DD Earphones? There we go. The lowest price was: $33.99.
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)).