A lot of original ender 3's in people's closets collecting dust. (Along with Artillery sidewinders and some Elegoo models)

Now they're selling for $40-100

They're not the fastest out of the box and take some work to get right.

It's a cheap intro to 3d cad and slicer software (the software that converts a model file to machine readable g-code)

They can also be upgraded over time for different use cases.

I keep one for PLA and have converted others for different filiments.

I just wouldn't use them for any production level work.