I live in predator central, but I haven't had any problems. The run that my layers are in is 8 feet high and extremely solid with a huge shed for a coop. I don't close them in at night. My ducks are in a run made out of T posts and poultry netting with a dog house to sleep in. Likewise, my Cornish X are in the makeshift pen that I described above. I have never lost a single chicken or duck to predators. In fact, the only loss I have ever had was because a layer fell behind a milk crate and got smooshed by the other chickens when they sat on it.
If you're really determined to provide a house for your meat chickens but you don't want to spend a lot on it, you have a few cheap options.
Option #1... go to craigslist and get a free dog house. People give them away constantly so it shouldn't be difficult for you to find them. It likely won't have a door, but you can put one on with a tiny scrap of plywood and a couple of $2 hinges. They won't fit well in it when they are full grown, but it would provide housing for them while they are most vulnerable.
Estimated cost: Under $10
Option #2... go to the hardware store, buy 2x4s and a couple sheets of plywood. Make a box and cut out a space for a door. Apply $2 hinges as explained above. Bam, you've got a functional house that can be as big as you want it to be.
Estimated cost: $60+
This assume you aren't looking for anything stylish.