I would go with option e) make your own. Blackbishop has some great instructions on his site for making a cat cut tarp. You will spend about $40 for the silnylon if you get it from speerhammocks.com. If you can sew well enough to add size to an exsisting tarp, then you have the skills needed to make your own tarp.
“Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it."