On the Class 3 dealer if it is out of state, you will need to find a C3 dealer in your state.
2. I would check subguns.com (.net?) for good prices, people are trying to offload the guns now. You can get Ac556's for around 7,000.00
And A word of caution, there is a reason they are so cheap, Ruger stopped making parts for them, Ruger will still service the weapons but when they run out of parts, they run out.