Product Size 160x 107x 80mm, Material ABS+PET, Induction of Bubble 1.2s, Standby Time 6 Months, Capacity 300ml, Working Temperature 5-40°, Battery Type 4x AA Batteries(Not Included), Product Weight 218g, Rated Voltage DC6V, Model BW-FD2, Working Humidity 0~855, Induction Distance 3-5cm.
Just check coupons out (with price alert and history). What is 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.
Link: Banggood product page
1. ($11.99): BGGRJA41
2. ($15.97): BG00c906
this code has to be applied 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): BGLOSZAC50, bGhOnEy10, BGBDBWFD2, BGHU0102, BGGKKEL1, BGZAXSDW50, BGZAXAZP50, BGZAXA50C, BgcLuBofErtA10, BGCDC067, BGBFC042, BGBWSD50, BGRUSIAN50, BGCNBFD2, 10%ForNewBW, BGBTJU07, BGBTJU0650, BGBTFEQ6, BGAFF10OFF, BGFE23Q9, BGCuponation10, BGHU0350, BGBWFD2CN, BGHU2402, 10%ForBGBW, BGXPDE34, 00c906
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for BlitzWolf BW-FD2 300mL Foam Soap Dispenser. The lowest price was: $10.99.
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)).