Cheapest way to make a large (900 sq ft) wall?


I just finished resloping my backyard by hauling in a 600 cubic yard of dirt. Now I'm looking to build a retaining wall around it. It is going to be on backside of my house, facing the woods. So, I don't care how ugly it is. The length on the back side is around 135 ft. I'll probably think of putting a better looking wall on the side, but I'm more concerned about that back part. What would be my best bet?

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