Coops can be as cheap or as expensive as you want them to be. If you're willing to use pallets for the wood, that makes it a whole lot cheaper! Some people are better at scrounging things, too. They have stuff laying around that isn't being used or have relatives or friends that do, too. You might find an old storm window you can use, etc. Slap some paint on it when you're done and it all comes together. Sometimes people pick up a cheap used shed or playhouse on Craigslist, too. They're easy to convert.
I would say one of the biggest expenses you'll have is the wire for the run. Forget chicken wire. It's not strong enough to keep out raccoons, coyote, fox or dogs. You might see if you could pick up a used dog kennel for a run, especially if it's the type that's panels that bolt together. They're very easy to move and I've moved mine several times. I would line the bottom couple of feet with hardware cloth and make sure the chickens are locked in the coop at night. You also need to line any ventilation openings or windows on the coop with hardware cloth, too.
I would say one of the biggest expenses you'll have is the wire for the run. Forget chicken wire. It's not strong enough to keep out raccoons, coyote, fox or dogs. You might see if you could pick up a used dog kennel for a run, especially if it's the type that's panels that bolt together. They're very easy to move and I've moved mine several times. I would line the bottom couple of feet with hardware cloth and make sure the chickens are locked in the coop at night. You also need to line any ventilation openings or windows on the coop with hardware cloth, too.