I know your going for inexpensive but have you checked out camo net spreaders. This is the newer style that military uses at least back in 2002. before these they was different.
http://www.ebay.com/itm/Military-Ca...pt=US_Radio_Comm_Antennas&hash=item4177c104f1
older ones looked like these http://www.ebay.com/itm/Camouflage-...377?pt=LH_DefaultDomain_0&hash=item4613cedf31
I know the older ones was a pain cause you had to spread the three arms out to break up the tension but using a tarp they would probably be better than newer ones. Newer ones is like a 1 ft circle with little nubs on top that may wear out a tarp. That's because of the netting style though older had bigger holes newer camo has small almost hardware cloth holes.
edit after looking at the e-bays the second post there shows new and old style camo pic 4-5 is new 6-8 is old style.
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