$14.99 – 380ML Smart Magnetic Stirring Cup w/LCD & Temperature Detection Self-stirring Coffee Mug Magnetic Stirring Cup Rechargeable Automatic Mixing Cup for Coffee Tea Hot Chocolate – White.
According to my DB the lowest price is $14.99 for 380mL Magnetic Stirring Cup with LCD Temperature (in Banggood). You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Latest coupon and price update (UTC):
Banggood ($14.99)
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood. But wait a sec… Is it a good price? Hmmm, price is higher than average (which is $14.62 right now), so better set price alert down below…
Link: Banggood product page
Price: $14.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGd42cf1, BG0ec3aa, BGa0a504, BGef2449
(probably won’t work, but you can try them out)
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 380mL Magnetic Stirring Cup with LCD Temperature. 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)).