I dont know where you live but it is available in Houston, Texas home depots. Also generally you can order an item be sent to home depot store for pick up, FREE. I dont know why they are charging for item to be sent and picked up at store. Ernest
3 for small tree
I have installed the same com-met tree ring and have no rust after a year. I used a 2x4 to hammer the rings into the ground to avoid chipping. Maybe you used a hammer and chipped the paint and it started to rust. But anyway you might use rustoleum spray paint, satin spruce green to paint and prevent future rust. see the attachment.
I use a hammer & brick. Lay 1 section parallel with edge of brick and give a few whacks once bent just fold and it will snap.
The Tree Rings Sections and the regular edging are all 4" tall.