Double A Vineyards carries them, but are listed as sold out. You could call them if you can't find (listed under Cynthia at Double A) and ask if they might have a few or b put on a list for next year.
As far as posts and trellis, you can use the wood your nephew brought you. Some untreated wood is alright to us. Are you sure it is pine? Most pines aren't real long lasting. What I have is White Cedar-which is naturally rot resistant without treating. There are some new treatments I haven't used so I can't speak for them. Some soak in motor oil, but I don't like that idea. Plain old cedar has been used for centuries to make cattle fences and last 20-30 years around here as long as it is a fairly big post.
I find stapling to the post with fencing staples works best as it can be moved or the post replaced easily if need be. When I first put some in, I drilled through the post like you say and regret it to this day. I can't move the wires wiothout pulling that whole row through the posts and totally redoing.
To keep the wires tight, use gripples to fasten the wires at the ends (hook the wire through the eye of the anchor and pass back through the gripple. I believe they have videos of the process if you need. You will also need some type of earth anchor for the ends of the rows. When they are all hooked up, you can tighten the wires using the gripple tensioning tool. Have fun.
Here is a link to Gripple's video library
http://www.gripple.com/library/?tag=Agricultural&q=Agricultural
If you don't have the wires up before then, our local growers association will be videoing the process at an upcoming future meeting- but you will probably be done by then. To help someone like you is the reason we are doing the series of videos we are. This weekend we are doing one on different types of pruning.