I think a stick of some sort is good to have, either to navigate mud and steep hills, to take stress off the knees, or to feel like if you need to you can fend off dogs (the nearly-mythical dogs).
Having said that, I've done a Camino with a stick I bought along the way. It was fine. And I've done a CAmino with my pacer poles. It was fine. Neither way was really better than the other for me. I did enjoy the pacer poles because I have wrist issues and they were easier on my wrists than the plain poles, but when I go again, I probably will NOT take the pacer poles (I change my mind daily) b/c of having to "keep track of them" or "worry about them" being stolen (which unfortunately IS a problem occasionally).
As far as shipping them, I guess we were lucky. We found a large mailing tube in a dumpster. However, on returning, we simply found a heavy cardboard box and wrapped them up snugly and checked them. They break down very small, so finding a box shouldn't be a problem.
If you are young, strong, and don't generally use a stick to walk, then I think using a pole you buy in SJPP or along the way is the answer. They are strong as iron, beautifully made, and help support folks along the Way. They also make a nice and USEful momento.
Flip a coin?