Private, face to face transactions, can be accessed through sites such as armslist.com and gunlistings.org.
Both are sites that I frequent to check for good deals in my area. This is, assuming, that you can do face to face purchases between private parties in your location without legal concern. In Ohio, the only concern is making sure they are of a legal age, and "checking them out" to see if they are possibly shady. The rule of thumb is easy; got a bad feeling? Don't do the sale/trade.
“Let it not be said that no one cared, that no one objected once it’s realized that our liberties and wealth are in jeopardy.”
"He who passively accepts evil is as much involved in it as he who helps to perpetuate it."
---Dr. Martin Luther King
"If you think we are free today, you know nothing about tyranny and even less about freedom."