Originally Posted by schaedel
No. These are made of concrete. I can find a lot of the blocks, but not
like those 4" on one side sloping down to 2" on the other. The 2" side
lays flush with the lawn for cutting.
Thanks for your comments though.
You're certainly free to do whatever you wish, but I wouldn't waste my money on them. When my sons & I did a lawn-care service, we loathed all such things. They never stayed in place, were a huge pain in the butt to mow around, and actually needed extra care. It was MUCH easier to just trim around the tree with a line trimmer.
That ringing endorsement given... I'd guess that your best bet is Menards. Lowes & especially Home Depot don't really carry a lot of variety. You might also look at a large nursery/landscaping business.