You don't mention where you are. You will need to be able to deal
with substantial weight. Choices:
RCP - reinforced concrete pipe. My local manufacturer is named
CMP - corrugated metal pipe. Sometimes referred to as Tin Horn.
Contact a scrap yard, pipe yard, or a local steel supplier and ask
Keep the whole world singing . . . .
Dan hit the nail on the head with asking your location.
I'd be willing to give you some leftover 30" and 36" RCP if you would pick
it up in southern NJ.
Seriously, let the group know your location and you'll get decent answers to
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