This is what I want, though I do not have it so I can’t speak to how it performs. Plastic is way cheaper and far more accessible, but do I really want to add more micro plastic pollution? https://www.kinsmangarden.com/product/Everedge-Lawn-Edging

We use natural river rocks or stacked flagstones. I just prefer the look of natural stone in a garden. Concrete bricks are fine for a more structured look, but I'm not a huge fan of plastic.

Anyone do that? Plastic, rubber, metal or concrete brick, which one do you like the most? I want to use plastic one, but I hear that they will not align straight line and turn wavy because of hot sun.