Not to state the obvious, but I just picked up 13+ yd of what I think is 1.1oz ripstop from WM in Littleton NH from their $1.50 bin.
I've never found anything worthwhile at my local WM but I was looking for something else while on a ski weekend and saw 4-5 bolts of the stuff so I bought what I had enough for in my wallet. You should check with all the WMs in your area to see if one has some.
Good luck.
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