Hard. No glass suppliers will have any, at least none did when I checked a few years ago.
I think Midwest has some, shipping will kill you of course. I may need to buy a whole new car just for the glass as mine is heavily pitted and rapidly de-laminating. I'm thinking about trying to repair the laminating issue (I've read you can dry it out really well to get the moisture out, inject something or other and reseal the edge and it "might" last a while. I have lots of little pits in mine which make driving into the morning sun downright dangerous, add in a few pretty serious chips and I really should replace it, at the cost of just a hunk of glass and getting it to me, I could buy a whole car with decent glass, which is (secretly) my goal!