ST Discovery Boards are a far cry from the $40 this supplier is asking. You can purchase it directly from ST or one of their approved vendors for around $20. The board itself and the free development environments are very good in their own right and a great way to get into 32-bit ARM programming once you've outgrown the Arduino. (But it's easier to start with a low-power STM32F1-based Blue Pill board.)
55" TV LG OLED55C2RLA 2022 HDR, OLED, dark titanium
38 Review
Vilros Raspberry Pi 4 4GB Complete Starter Kit - Black Fan-Cooled Aluminum Case for Heavy-Duty Performance
12 Review
🌐 MCIGICM 2 Channel DC 5V Relay Module: Optocoupler Low Level Trigger Expansion Board for Arduino UNO R3, DSP, ARM, PIC, AVR, STM32, Raspberry Pi
11 Review
GeeekPi Raspberry Pi Cluster Case with Cooling Fan and Heatsink for Pi 4 Model B, 3 Model B+ & 3/2 Model B
11 Review
MacBook Retina 13-inch (A1425, A1502) and 🔩 15-inch (A1398) Bottom Case Screw Set with Pentalobe Screwdriver
11 Review
🖥️ Helifouner 450-Piece Computer Standoffs Spacer Screws Kit: Ideal for Hard Drive, Motherboard, Fan, Power Graphics & Computer Cases
10 Review
🔧 Premium Repair Replacement Screws & Tools for MacBook Pro Retina 15"/13" - Complete Bottom Case Set
10 Review
Comprehensive 500pcs Laptop Screw Kit Set for 🔩 IBM HP Dell Lenovo Samsung Sony Toshiba Gateway Acer
12 Review