Comment by jononor

For 10 USD you get an ESP32S3 board, which can do basic computer vision tasks. For example using OpenMV or emlearn-micropython. For 15-20 USD you can get a board that includes an OV2640 camera. Examples would be XIAO ESP32S3 Sense, LilyGo T Camera S3 or "ESP32-S3-CAM" board from misc manufacturers.