Go to your local Pallet company,they have lots of broken palets that are mostly oal and they would work beautifully,what about chicken wire or used chainlink?
This is a lot of work,but you could use free pallets that newspaper offices set out for free pickup,take them apart and use the 2x4's or other material that these are made of.
Check out Bamboo coverings. They come in rolls and with ties. All you have to do is roll it out and tie it down. http://www.bamboofencer.com/rolled.htm is a great site for bamboo (and other woods) fencing.
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