I am looking to start my first build and I am trying to figure out where I could find a lower receiver. I'm still relatively new and my understanding is I can't purchase one online without an FFL. This brings up 2 questions for me.

1. Is there anywhere in the Boulder/Denver area that sells lowers and the parts kits individually?

2. My state of residence is New York (out here for college), would a store even be able to sell me a firearm?