I realize that bending is far more cost effective.
Be aware that most "steel yards" have odds and ends of various material left over from custom cut orders. These chunks of material usually end up out in a corner of the yard and are referred to as "rems" (remnants); as mentioned, they're sold by weight.
But have you ever tried to bend 1/2" thick plate steel? That is going to take a substantial press, or a lot
of heat (and getting an aesthetically pleasing, uniform radius, bend is another thing altogether).
Post a sketch or two and maybe we can help you sort this out.
BTW, welcome to the boards Brandon.