I bought one of these on Amazon last week for $25:

https://www.waveshare.com/esp32-c6-touch-lcd-1.47.htm

I've been really impressed. It's basically a hackable Fitbit with no strap or battery. Full wifi, BLE, 6-axis motion. It's was really easy to get the C demos running. LVGL is awesome. Can't speak to Rust. I get enough of that complexity in my day job.

Other brands that look good for beginners are Elecrow and Makerfabs.

I specifically wanted to get into RISC-V, but they all have boards for other architectures as well.