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Just ask around at construction sites, they usually can give you something. One construction worker gave me a few shorter scrap pieces (still fun for pole jams and stuff) and basicly told me to come back when he and the rest of the workers weren't there and take a bigger one, haha.
But if you cannot find any sites with them, they do usually have them at most lumber yards (lowes, menards, home depot,...) and they are Not $200. They are around $20-$30 for a 10ft long 6in diameter pipe.
So first check construction sites because it's free and they are usually longer (mine is a little over 14ft I think), but if you have to buy one, I suggest it because they really are so much fun, and very easy to learn and progress on.