Corrugated iron garden bed edge protection

Ok ... so after dabeling with some ecowood that I subsequently decided didn't suit my design, I made some oval shaped corrugated beds (with the help of a roofing supply company). I went all out and now have six of them but I'm struggling to come up with an affordable way to protect garden users from the rim of the needs (edge of the iron).



Normally the go would be a rubber pinchweld extrusion ... but at $7 a metre it'd cost rather a lot (I think the total perimeter is almost 50m)! I thought I'd put it out there and see if anyone had any spiffy ideas.





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