Garden border edging - like the hoop-ey type - small amount (Dartmouth Park N19)

Hello everyone, we are making a small community street tree pit or two in N19 and looking for a few metres of old garden border fencing to try to keep the cars and dogs (and foxes!} off the plants. You know the type - wire hoops that you stick in the ground - would be ideal. Can collect. Any small bags of topsoil or compost also very useful and appreciated!! Thank you.