When I was updating this page, then coupon price was 18.39 USD for GPS Module (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest price update (UTC time):
Banggood (18.39 USD)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). Isn’t it too expensive? From what I can see this price is higher than average price (15.96 USD).
Link: Banggood product page
Price: 18.39 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGMatt2022, BG589b2e
(there’s a little possibility that old coupon will work)
Aliexpress
Click here… to search for HGLRC M100 MINI GPS Module for Drone on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for HGLRC M100 MINI GPS Module for Drone.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).