You won't need to be worrying about concrete for a while anyway, so (depending on what you can get baskets for) somewhere around $250 per hole should buy a basket, some brick for tee box markers, a 4x4 for a sign.
Quite likely there's brick somewhere available for the taking (whether you ask or not is your business :twisted: ) Maybe you can get 2 businesses per hole, that compliment each other somehow?
We did a quick, easy, and relatively painless basket installation with oversized PVC for a sleeve and put a bolt through below the surface of the surrounding dirt. Then, some QuikCrete and half a big bucket of water, buried it totally so there's no way of knowing that the basket isn't really secured, and it's done. Depending, of course, on how tall the poles for the baskets are.