$5.99 – Wooden Electric Powered Coin-Eating Robot (Banggood, Aliexpress: Wooden Electric Powered Coin-Eating Robot Manual DIY Puzzle Assembly Technology Small Production Creative Invention Mechanical Science Toy (the best price with coupon)).
I have just checked coupons. The lowest price I could get is $5.99 for Wooden Electric Powered Coin-Eating Robot (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Best price?
Latest price update (UTC time):
Banggood ($5.99)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. Is it cheap? Awesome! This price is the best in CouponsFromChina database!
Link: Banggood product page
Price: $5.99
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
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.
Price history and price alert
Here is price history (for all/most countries) for Wooden Electric Powered Coin-Eating Robot. The lowest price was: $5.99.
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)).