How do I cheaply create a raised garden bed?




we need to find something inexpensive to use to make raised garden beds on our large unlandscaped yard. we have tried treated landscape timbers in a small area but they gave way to insects, and rot. so any ideas for a cheap alternative is so greatly appreciated.
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Cinder blocks are popular. Order and have them delivered.
Concrete blocks.
here's what I did - https://www.charlestoncrafted.com/2017/03/07/diy-raised-bed-garden/