Realizing that cost will vary in different areas of the country, can anyone offer a @ linear foot for this stuff?

Thank you for any information you can share with me.

This is an arbitrarily chosen website to demonstrate what I am talking about:

And from a company somewhere in Pennsylvania..."The amount of site preparation needed for a particular job may affect the final price. The price range for landscape border is $5.00 to $12.00 per linear foot."

Calling and inquiring or having someone local come out to give you an estimate on continuous extruded concrete edging is, I know, the obvious solution. But from reading a couple of websites - the company would have to look at your terrain, be aware of impediments, in-ground sprinkler systems, etc. and working around/through obstacles would add cost.

Here's a pic with mower edge on one side of a walk and standard on the other. Sorry it's not a better close up.

I started my project 5 years ago with a pond, a rock garden, and a block wall. The rocks and the wall were structural elements to hold up a hillside. Year two, I took this picture of stairs down to the curbed lawn and walkway. I chose the curb because this is on hard pan and I had to load good soil into both lawn and bed and didn't want the edging moving. Now beginning year 6, the old deck and stairs are gone. There's a new deck with sun room and hot tub below with stairs that angle down with the wall. There's a walk with red paver steps and grey gravel and all the beds are full of plants. But the curb still lives on, cleanly separating hard from soft. You can see that first peony I planted behind that old red chair. The regular curb borders the walk all the way around the lawn till it meets the walk on the other side where that other pick was taken. All told I suppose I have between 3-400' of it.

Thanks for your input.