We have a super-sloped front yard I did diagonal raised beds in and have been raising fruit, veggies, trees and flowers for over a year and since it's working I'm now ready to swap out the waste lumber I built it with (which ain't working) for plastic/fiberglass edging but because of slope will at worst need heavier plastic stakes maybe 15" long (edging 5") that don't cost an arm and a leg (have to run 100 feet at that depth and another 100 feet at regular short). Can't find so far. Thinking about cutting stakes from recycled plastic lumber, suspect darker pipe (PVC sched 80) will be too expensive and bust when pounded into ground. I fall all the time out there and don't think rebar sticking up is a great thing to break my fall, wood is nothing but pillbug food. Resources, ideas?