55 W.
Price history, coupons and price alert are available on this page. You probably want to know what is the best price?
Aliexpress
I could not find it on Aliexpress. 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. Only one coupon available!
Link: Banggood product page
1. ($49.39): Cuponation9
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGXiaomi55W, bgshOOp10, BG9Xiaomi55W, 7d18f7, BGXMWC5G, BgcLuBofErtA10, BGXM55WC, BG12Xiaomi55W, BG20CHARGER, BGAFF10OFF, BGMBCBLE, BG3Xiaomi55W, BGCuponation10, 13f142, BGHONEY2110, BG883e0d, BG537235, BGc82e9c, BGa76a12, BG044e7a, BG76aafc, BGe6e237, BG531c83, BG040312, BGCCARG, BGeaa785, BG563f9e, BG7eb731, BG85d5c6, BGALIBUY078, BG5e832f, BG1efeb0, BGf90be1, BGHU2110, pROMo8cuPoN, hoNEYbGdeAlS, BG466a1e, BG7c993f, BG4c5f85, BG210947, BG8ReviTrage, BGcoupon8off, BGGutscheine
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi 55W Wireless Charger [EU] ($-3)
Price history and price alert
Price history (for all/most countries) for Xiaomi 55W Wireless Charger is here. The lowest price was: $28.99.
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)).