Pretty much all of them within about a 12 mile radius, that would be 6 stores. But I am no longer in the Northeast, having moved South in 2015, or I would have been asking if anyone knew of any places that carried the specific gun, namely a G19 MOS Gen 5.
I did buy 1 gun from Buds shortly after I moved here, but I haven't seen the Glock in stock at Buds recently. If one of the dealers at the Mill had one or could get one for the "normal " price, I would be happy to purchase it from them and have them ship to my LGS. I wish there was an easy way to let all the dealers know what I am looking for, I really don't want to try contacting each of the 50? dealers separately.
If, by chance, you come across one, pm me with the dealer contact info and I'll call them and see if we can do business.