Answer: I can think of several possibilities for a deeper edging that can be made at home, but they may not be as inexpensive as you are hoping andunfortunately except for the last one, they are not exactly what you asked for. You could use concrete poured in place, recycled boards, or possibly cut up sheets of roofing panels. Discarded cedar shakes might be another possibility. Another option is to forego the installed edging altogether and simply edge the bed by digging a steep sided trench. Finally, you might be able to use sections of old automobile tires although I would not recommend this for a vegetable garden. I hope this gives you some ideas.
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