Simple black lawn edging (Golden Triangle)

Looking for about 6' of simple black rigid lawn edging. This is going to be installed between two rows of interlock stone. Prefer edging that doesn't have any nail slots. (but I can cut them off) and without a bulging top - some of them have a rounded top - I'm just looking for very simple, basic, almost like plexiglass, but in black. Do you have any I can take off your hands?