Kaonashi No-Face Piggy Bank (Banggood, Aliexpress: Materials: ABS, Stem From: Japan, Capacity: more than 100 coins, Power by 2x AA battery (not included) (the best price with coupon)).
You can create price alert here, copy coupons and view price history. Best price?
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. ($16.85): BGAFF10OFF
2. ($16.85): BgcLuBofErtA10
apply it 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/5cd
Old coupons (from the oldest to the newest): 502C6B, Hardware, TTxBG10, 2019SPEDM, bgssaff9, AFfbG10, BGhardware, BGBFAFF2019, BGCITYADS2019, BG2020NS, BGVDay10%off, BGMPB2020, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGHWDEALS, BgoFErTaSchInA10
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for Kaonashi No-Face Piggy Bank. The lowest price was: $9.99.
Price records source(s): Gearbest, 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)).