Top Quality and Cheaper don't usually go together.
So do you want top quality or cheap or are you concerned with aesthetics ?

Composite wood products range in price and size. Starting at about a dollar a foot for the cheap plastic 3/4 by 4 inch stuff.

Then you graduate to a heavier width that is wider and has a more attractive look and will last many years when properly installed.

Steel is quite stunning especially if you have a modern project and will last quite a while and age beautifully , especially if you have a skilled craftsman do the installation.

I like a trench edge (aka Victorian or natural) steel or aluminum edging or a brick or paver mowing strip. I would not give you 2 cents for plastic edging. Unless it is super expensive looking, I do not like edgings that stick up above the grade. I think they junk up the overall picture. You can Google images for landscape edging or any of the specific types to see examples.

Hard to beat a good steel edging for holding grass in check. Nothing will prevent turf grass from crawling over the top of it, but you can easily control that with a weed eater. HD or Lowe's is where I would go for it. If you want a more elegant appearance, you can place river rock behind it. Goes for about $.30 a pound, say maybe $6.00 a foot.

No I don't want chap stiff.