I had to cut the pipe and put a 45 on. Without looking into my records, the 20' x 36" dia. pipe was about $1100 and the 45 was $750. It is a dual wall pipe and doesn't bend. I installed it for $2800. To load, transport, and install it only took me and one of my staff about 3 hours. I do own a mini-x, which was on site anyway.
The homeowner screwed rock wall climbing cleats into the sidewall so the kids can climb up and down. We just cut if off to final grade and the homeowner's builder built a hatch for the top opening.