Noah Lamport has silnyon for $3 a yard. They only have a few colors, (black, silver/grey, royal blue, blaze orange to name a few) but that is an unbeatable price. 10 yard minimum and $5 cutting fee.
You have to call them, no online orders. Hope they still have it. (800) 548-6940
I bought 10 yards of the black and I love it.
BTW, ripstop from Joannes is NOT treated, if you haven;t already figured this out.