Forgive me. Even though I'm very slightly handy, I don't know the first thing about pricing.

How much do you think it would cost me to construct a fence and gate like the one in the link below?

I have 27.5 feet I'd like the fence to run. I don't need it to be too high. Just high enough to keep children in. I guess the gate should be about 4' wide. I'm thinking I need four 5' pressure treated 4x4s and two 10' ones.

I plan to grow some vines on the wire (or nylon?) mesh.

And by the way, I plan to take the thing down in a couple of years. It's just to easily keep track of some kids in the yard... don't want any wandering during a diaper change.

Must I cement the posts?

I have all the tools and saws and a hole digger. Thanks in advance!