Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
Port: USB-C, Output: 5V/3A, Input: 100-240V- 50/60Hz 0.5A Max, Model: NKA09E, Product Net Weight: 54.8g, 9V/2A 12V/1.5A, Total power: 18WMax, Color: White
Aliexpress
There’re some similar (or not) items on Aliexpress
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. ($17.85): Cuponation9
2. ($18.05): TTSUMMER8
3. ($18.44): BG00c906
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 13f142, AFfbG10, BGMPB2020, BGAFF10OFF, bGhOnEy10, BGXMI15, BGdragonBoat, BGSS10%SW, bgshOOp10, BgoFErTaSchInA10, BGHALLOWEEN, BgcLuBofErtA10, BG20CHARGER, BGMBCBLE, BGCuponation10, BGHONEY2110, BANGGOODSD, BG85d5c6, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGJUNEGSG9
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Nillkin NKA09E Bijou 18W PD Charger.
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)).