$18.99 – Stall Torque: 1.6 kgf-cm, Charging cable: No include, Battery Capacity: 500 mAh, Charging Port: USB Type-C, App: Smart Life/Tuya Smart, Working Temperature: -10 ±45℃, Wireless protocol: Bluetooth 4.2, Maximum Movement: 8mm, Bluetooth signal distance: ＜10 m, Work Mode: Click / Switch, Dimensions: 48x 37x 33 mm.
When I was updating this page the price was $18.99 for Smart Switch Button Pusher Fingerbot (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood ($18.99)
Banggood warehouse is located in China. I have no active coupons for you right now. Low/high price? From what I can see this price is higher than average price ($15.53).
Link: Banggood product page
Price: $18.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGXIFD646, BGXIFD751
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
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
Check out price history chart (for all/most countries) for Smart Switch Button Pusher Fingerbot. The lowest price was: $13.99.
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)).