I hope that didn't come across the wrong way because I didn't mean it rude. I have a son and homeschool him, I'm disabled, so my budget is super tight. I was thankful to be able to make it work. I used parts off a dilapidated camper (siding, door, windows) to build my coop and some old plywood for shelving, so I had to buy concrete (just for the corner posts, had to secure them), screws and nails (5$ a box), some shelf hangers for my bracing (2$ each), 2x4s (3.50$ each, bought 24 of them I think it was), of course the feeders/waterers (bought as a set for just 11$ with shipping), and some other minor things for initial cost, plus 13 chicks (one died because something neurologically was wrong with it, and the other was a RIR roo that went back to the store) which weren't too bad in cost they were 3.50 each (I paid for already sexed, and it was split by 6 weeks between buys in May and June). Then I had to buy chicken wire (found 2 large rolls for 45$) and staples (that was a few buck for a couple boxes) for the staple gun, and I made a run using a trampoline frame and some tent poles (you know those outdoor canopy things) so the only cost on the run was chicken wire since I had the rest.
While you guys are waiting you can check on craigslist in your area and other resale shops/inexpensive shops to start gathering materials so you can work on building up what you need so it doesn't hurt the pocket too much if you can find room in your budget each month.
I started buy stuff I needed over a few month span, so it was easier on the pocket for me. I still need to buy paint to paint the coop, but it's functional.
Then I built a mini coop for the younger chicks to transition outside without the big ones picking on them (look but don't touch approach because the other method didn't work) and I used leftover supplies from other projects to make that plus leftover chicken wire so thankfully no cost on that.
For now my nesting boxes are laundry baskets and some organizer bins with straw in them. I'll be building something else eventually, but it works for now.