Retaining walls are inherently expensive. Expecially if you're on a hillside.
My wife and I avoided paying 100,000 dollars to support our backyard in
Silverlake, after the heavy rainstorms two seasons ago. After a year of
trying to find solutions to our major problem, We decided to use the interlocking manufactured stone blocks that you can get at home depot or
the like. We were able to remove dirt, install the block walls and fill them with gravel (for drainage) for around 6,000 dollars. We employed our gardener to do the work. Much more feasible for