I bought some plans similar to BCR's bender to make my own a while back, but the dies are expensive. At least from what I've seen. He said something like $300-325 in the bender. I bet it's mostly in the die, and jack.
I've also seen a few cheap benders on ebay. But I wasn't sure if they'd work for a cage or something. Since they don't have the right size die. I was thinking 1-5/8" x .134 tubing for a small cage. Seats back and maybe a pair of low door bars. I don't want to fall on them getting in and out everytime.