Great Northern Sports center, in Derry NH has all kinds of ammo to much to list, they had everthing, and a bunch of AR's also  

I'll second that.  I was in there on Saturday with a friend of mine who was picking up a Ruger LCP, and I noticed they had a LOT of ammo, all different calibers, and the prices seemed to be in line with what most are charging these days.  I had read some "not so good" reviews of this store before, so I was hesitant about even going in, but I am really glad I did.  The two individuals working the store (husband and wife from what I understand) were very knowledgeable about everything that came up, and show GREAT interest in my AR build I am working on, as well as making several suggestions on revolvers, which I only very briefly mentioned at one point.  The gentleman working there was very quick to open up one of the cases, and let me handle every one of the revolvers in there, so I could get a good feel for what I wanted.  They get a big thumbs up in my book!