I just spent the weekend planting 10 hop rhizomes in a patch of land owned by a friend in Charleston, IL. we constructed a trellis for fairly cheap. We saved a boat load of money on the lumber - go to your local big box hardware store and ask for a "damaged lumber" discount. We were able to find four 16' pressure treated 4x4s that were slightly warped. The 16" posts were originally 20 dollars...we paid about 3 dollars with a 85% off "damage" discount. These posts don't have to be super straight...just high enough to support the growth of the hop bines. And, these poles were only slightly warped...and i mean slightly.
Anyways, here are some pictures of my Hop yard:
