An average trip to Home Depot might last a couple hours, but we were armed with a shopping list that never seems to end. When you're building four 20' x 45' high tunnels there are a lot of materials to remember. This trip included 2"x 6" material for the hip boards, 2" x 4" material for the end walls, and lots of fence pipe for the legs and ground posts. We were very fortunate to get all our bows, wiggle wire track, and wiggle wire from someone on Craigslist. That's a great site as long as you're persistent with your searches and willing to jump before someone else snatches up a great deal.
The original greenhouses (two 20' x 90'), which we disassembled quicker than we thought (one day) had four foot side walls. We decided to extend the side wall height to six foot to ensure enough room a long the edges of the greenhouse for plant growth and walking.