How high a level do you have to be before you find glass and ebony armour and some of the other exotic stuff? I am at level 11 and close to the end of the main quest. I may have to hang around and work on leveling up to see some of this stuff.

Alice, strange that you can't find Shum-Gro. I run into him everytime I visit the castle.

I think I started consistently finding glass and other armour and weapons at around level 20.

I'm at level 40 right now and find pretty much non-stop Deadric, Glass and Ebony stuff. On the other hand, reaching level 40 meant that my enemies just got exponentially harder -- or so it seems.