Here you go hope this helps.
You can also use urethane coated nylon. It's heavier and cheaper than silnylon. It's also stronger. ;-)
Go all the way. Get one use it to camp, then search for the directions in here on how to turn it into a Cat-cut tarp. That will make it lighter, less bulk, render a taught enough pitch to quiet it down some. Make it look uber cool!
Hone both your lay-out and thread injection skills, or just learn how to, for the first time.
Then instead of buying an expensive UL tarp, order the parts and make your own!
Design the next best thing hanging, and roach us all on it!