Well, I feel like an idiot. Metal Supermarkets was such a great store for the round tube for the rotisserie, that I decided they deserved my business for the rest of the steel for the brackets. Turns out, they are great for smaller odds and ends, but pretty bad for regular lengths. I ended up paying about double on two 10' lengths of 2.5" square tubing.
Makes my stomach hurt. $100 down the tubes. Shit.
I still like that store for odds and ends. But next time I will go with Wasatch Steel or Metalmart for the other stuff.