I bought from http://www.orsupport.com. Danny Asbille is the sales guy. They just sent an email today "We just received 7 demo and 3 used c-arms along with several demo c-arm tables. They all are in great condition. We guarantee to beat any competitive quote by $2000 on the c-arms - $1000 on the tables and give you a longer warranty ".
Pricing varies on number of motions. I bought new for around 7k.