Hint: look for new construction in your area. If there is one thing construction workers love, it is cold beer. I traded a $7 six pack of beer for a half roll of tyvek when the new McDonalds was going up in town. If you are only wanting enough for a ground cloth, they will probably give you a piece. I laid mine out in the sun and then repeatedly crinkled it to soften it up. Then ran through the washing machine. Soft and quiet. Typar is not the same as tyvek, but I guess if you are just using it for a ground cloth it would be okay. I made bivy sacks for my sleeping bag and ground cloths out of the 9'x75' roll of tyvek I scored.
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