I've never been to the Home Depot in Reno.
But if its anything like all the other major "one stop shops" between Reno and Fernley, or Winnemuca and Fernley, they will be prepared.
They know Burners are coming from all over the world, and are going to need supplies. They know what supplies are commonly needed for Burning Man. And since they want to make the sale, they will likely have it in stock.
And likely, it will be piled right inside the store, right when you come in.
Obviously, 2x4's can't really be stacked right in the front, but I'd imagine that rebar, rope, and tarps are readily available.
Though, of course as previously mentioned, go ahead and call ahead! Never hurts.
Another idea, is to call the Home Depot you plan to hit, get ahold of the Pro-desk, and pre-purchase what you need. I don't know if they do it for individuals, but we do it for work all the time. When we're going to another city to install medium sized satellite dishes on flat roofs that are still under warranty we'll call the closest Big Box and pre-pay for our cinder blocks. We'll also ask that they have them on a pallet out front, so that when we pull up we can start throwing them in the truck right away.
If you pre-ordered you material they would be required have it there for you.
Why don't ya stick your head in that hole and find out? ~piehole
Plan for the worst, expect the best. Make the most out of it under any conditions. If you cannot do that you will never enjoy yourself. ~CrispyDave