$39.99 – that is current price with coupon for LILYGO T-Display-S3-Long 3.4-inch Touch Display ESP32-S3 Development Board (in Banggood). Check coupons or create price alert down below. You probably want to know what is the best price?
LILYGO® T-Display-S3-Long 3.4-inch Touch Display ESP32-S3 Development Board TFT LCD Wireless Module WiFi Bluetooth 16MB Flash – Board Only
Latest price update (UTC time):
Banggood ($39.99)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). I think you want to know if the price is good. From what I can see this price is higher than average price ($38.21).
Link: Banggood product page
Price: $39.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Aliexpress
There’re some similar (or not) items on Aliexpress
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 LILYGO T-Display-S3-Long 3.4-inch Touch Display ESP32-S3 Development Board.
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)).