Raspberry Pi Zero WH not available: Alternative?

Unfortunately the Raspberry Pi Zero WH is not available and we need 20-100 for student education. Is there an alternavtive? Which available platform could/should be used in future instead of? WiFi, some I/O ports and cheap (<20$).

Well I think there is only a Pi Zero W or do you want them with a header so WH? I know Digikey sells pi pico W for like $6 and has like 17k of them a few days ago, but down to 15k now, but you would just need to buy a bunch of single row headers to solder them on. Otherwise you might have to go with an ESP32 maybe if those have enough I/O. Like this for an example https://www.amazon.com/Development-Microcontroller-Integrated-Antenna-Amplifiers/dp/B09GK74F7N/ref=sr_1_4?crid=D3EVODMEZCH2&keywords=ESP32+wifi&qid=1667606608&qu=eyJxc2MiOiIzLjc1IiwicXNhIjoiMy4xNyIsInFzcCI6IjIuNzQifQ%3D%3D&sprefix=esp32+wifi%2Caps%2C120&sr=8-4

Here in Europe, Raspberry Pi (all types) aren’t available since months. Next stock 2023/Q2 earliest. If anybody has some Pi Zero W or WH let me know! I need 20…

Does it need to run an OS? ESP devices are widely available. ESP8266 or ESP32