Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – LILYGO TTGO T-Display RP2040 Raspberry Pi Module [EU] (-3 USD)
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
Coupon (16.21 USD): BG589b2e
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): pROMo8cuPoN, BG00c906, BGJUNEGSG9, Cuponation9, BG4a9f1e
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – LILYGO TTGO T-Display RP2040 Raspberry Pi Module [EU] (-3 USD)
Price history and price alert
Here is price history (for all/most countries) for LILYGO TTGO T-Display RP2040 Raspberry Pi Module.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).