You can also buy them ready made out of great quality ropes from Summitt in 30 feet models. You can get one for $35 or order their 3 pack for $89. Nice thing about them is they're 30 feet. The single comes in a nice small carry bag. I'm not sure if the 3 do or just come loose.
http://www.summitstands.com/productDetail.aspx?id=329148