I was at SAIL today looking for a canoe dry bag and I came across this 12'x 10' tarp made by Yanes for 54.99 i set it up in my backyard and found that the seams are sealed and there is webbing loops all around. the ends fold in nicely to close off the ends.
So if anyone on a budget is looking for a inexpensive tarp. you may want to look at this one. I got it at SAIL in Burlington, Ontario