Go to the Silverado Gun Show at the Frederick Fairgrounds this weekend. Go early, fondle a bunch of new Glocks, see how they feel, see the prices, talk to the dealers. Look, touch, listen, learn.
I bought all of my Glocks and most of my guns at gunshows in Virginia, from major reputable dealers who have been going to every show for years.
That said, prices are much better in Virginia than in Maryland.
Going to look at Glocks with an experienced friend is much better, of course.