Seb,
where I get the cheesecloth is pretty much any supermarket. I go into the section where items like boxed stuffing would be (maybe in the spices area too) I buy what is called Poultry Stuffing Bags. Super cheap. You could also use medical gauze to get netting, but I prefer the cheese cloth.
Russ taught me this, when you want to lay your netting, here's a quick and easy (although messy) way. Take a cup, add what every color paint you want...here I used just brown acryllic paint, add some water and white glue. Thoughouly mix, and add your netting. Mix it well with your hands until the netting has been "stained" with the paint. Now, take the netting, and wring it out with your hands, but leave some moisture. Place where desired, and let dry. Boom, the netting will stay in place when dry, hard as a rock, and then I just drybrush some cammo patterns and I'm done.
"There you go with those negative waves again!"