Tons of grouse up in Pennsylvania. And there are plenty in West Virginia too. And you will even run into them in Virginia. Their populations vary, but the only tried and true way to get on grouse has always been boots on the ground. The more shoe leather you were off, the more birds you will flush.
Quail, of course, is a different story.
You can also waterfowl if you want. Plenty of ducks and geese about, that's for sure.