Rated Energy 13 /500mAh 5V (TYP 2A), Input: USB-C (INPUT) 5V=2.4A / 9V=2A / 12V=1.5A (18W MAX) USB-C (IN): 5V=2.4A / 9V=3A / 12V=2.5A / 15V=2A / 20V=1.5A (30W MAX), IP Rating IPX5, Capacity 20 /000mAh 3.85V (77Wh), Weight 11.45oz, Capacity 20 /000mAh, Output: USB-C (OUT1) 5V=2.4A / 9V=3A / 12V=3A / 15V=3A / 20V=2.25A (45W MAX) USB-A (OUT2/OUT3): 5V=2.4A / 9V=2A / 12V=1.5A Multi Ports: 5V=3A (MAX), Maximum Brightness 1 lumen, Dimensions L-5.37″xW-2.36″xH-0.84″, Weight 324.5g (11.45 oz), Battery Type 21700 Li-ion Batteries.
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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 code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($98.13): BGAlerabat15
2. ($103.90): BGtorch2
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): 4BLF, BGHONEY2110, BGNB20000, FIN8358, BG10OFFAFF, BGwhielabel, BG10OFFAFF1, BANGGOODSD, BGTorch4, 00c906, BGtorch3
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for Nitecore NB20000 20000mAh Power Bank? There we go. The lowest price was: $88.95.
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)).