I didn't get them from Tractor Supply. There was no Tractor Supply here when I got mine. $20 (actually $19.99 or something) is the price on the Tractor Supply website. Check your local Tractor Supply store for availability. Order if necessary.
I tied my cattle panels to the roof of the pickup to get them home. Padded the roof and anchored them via the front and rear bumpers, plus some side-to-side ties for stabilizing. Don't recommend that method because you can ding up your vehicle if you aren't careful. My truck was an old beater so I wasn't too concerned about dings. It helped that I wasn't going far with the load. I wouldn't drive on highways or long distances with the panels loaded the way I had them. I was glad to get home safely that day
Some people arch them in the back of the pickup to bring them home. My pickup has a shell so that technique wouldn't work.
Sorry, I don't have any photos of it under construction. It's hard to see the construction now, with all the hardware cloth and tarps on the coop.