10' 2x10 pressure treated lumber, halved (2@$11.97)
corner brace 4-pack (2@$3.59)
#8 x 3/4" wood screws (1@$4.47)
Home Depot cut the 10' lumber in half for me so I ended up with four 5' boards. After that's done, it's all just assembly. I put two corner braces per corner, a couple inches from the top/bottom. I didn't measure, just eyeballed it since it's all going to be covered by dirt anyway. I also found no need for drilling pilot holes.
The whole thing took less than 30 minutes to put together with the help of husband's ankle supporting the outsides while I screwed in the braces.
