I live in Canada, (ontario) and I ordered them from a local feed store. They just call them "white rocks" or "meat birds / Commercial meat bird". They grow fast, love to eat and are ready for slaughter in 7 weeks. I assume there similar to CX, admittedly these ones did get to fat to fast for my...
I have my birds in a tractor, I have 2 x 0.5 x 8 square "container" that always refills the 8 foot long troff below. I give mine free feed, so I just pour 3 or so bags in and there good until slaughter.. Does make moving it a little heavier though. Works for 30 birds no problem.
Edit: (This is...