Material: PC+ABS Shell, Dimensions: 136*70*14mm, Input: 5V/12V, Output: 10W/7.5W/5W.
Check coupons or create price alert down below. 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 code price check (UTC time):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
1. ($15.28): BGAFF10OFF
you should apply the coupon 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): 16FWC2, 13ca80, Alibuy91232, S20BW, wirbw24, 20FWC2, 502C6B, alibuybb, 12blitzw, bgwf2wc, BGPLBWCH, 2019SPEDM, BGss10%bw, BG3CSUM, BGFWC2BW, BGbwfw2, BGbwqi2, BGBWFWC2, BGwbFWC2, BGFWC2PL, BGBWFWC22, AFfbG10, BGwbwc27, BGVDay10%off, BGBWC25, bGhOnEy10, BGXMI15, BGdragonBoat, BGSS10%SW
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for BlitzWolf BW-FWC2 Wireless Fast Charger. The lowest price was: $9.99.
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)).