That's about the price, $80-92.
It's just a couple "L" shaped square metal brackets attached together with pins for the 3 ph. The brackets have predrilled holes to attach bottom/back boards. I bolted a pallet to the bottom and 1 bys to form the back. Then put some brackets around the bottom of the pallet to insert 2 bys to hold up some sides. I made the back panel with a hinge to fold it down.
Do a search, and you'll find pictures of mine and others' designs.
Ralph