Can anyone tell me where to buy those large commercial real estate signs? Also, can someone tell me how these are installed? I have a friend who wants me to market a vacant lot that is zoned for commercial use. Any advice would be greatly appreciated.

We use a sign company to maintain and install our signs. If you are buying from a company such as Dee Signs then 2 are about $202 each with minimum of 2 signs in an order. They are 4'x8' 1/2" MDO and designed to mount on 4x4's.
We use a local sign company that makes the signs to CBC specs.
I always show $400 for signage which includes signs, installation, removal and storage till it is used again.

Thanks, Paul. I'll look up Dee Signs, and see if they can design and ship one to me.