Actually, I would say that finding camo silnylon would be more akin to finding the "Holy Grrrail". It may be out there somewhere, but I've never seen anyone or known anyone to actually have any. It's getting closer with the olive and brown colors, but still no "patterned" silnylon (that I've seen). Once we get to patterns on silnylon, then we'll see some cool tarps.
I have looked but yet to find digital camo in silnylon. Found some in what I thought was DWR ripstop and/or PU coated. It does weigh more due to coating. Seems to be a an item that is in low demand apparently.