I voted $7. If it was a standard Shaker, would probably be 4 or 5. But if its a nice glass, something that I would want people to see me drinking out of, I think $7 is fair. But remember, Seattle has a higher cost of living than a lot of places. If you filled it with beer, I think $10 or $11 is fair.
Like most people, my pint collection is almost all glasses I picked up for free at brewers nights or such.