Ripstop nylon is what I'm going to make my hammock with. Fabrics
I don't know your weight, but keep in mind on the weight of the nylon so it will support your weight. One layer of 1.1oz ripstop will support 200 pounds. If you weight more than that you need an extra layer of 1.1oz. You could also get 1.4 or 1.9oz ripstop. This website has a general idea on weight of nylon to support your body weight: Warbonnet
I would recommend using Silnylon for the tarp. I have a Silnylon that 132" long and 92" wide weighting 10oz.
The first link I showed you seem to have a lot of the materials cheaper than elsewhere I've been on the web.