abt.com has the avh-4201nex for sale at $500. this is the bundle that includes the back up camera. currently pioneer has a rebate where you get a $150 gift card back for purchasing this unit. most people won't have sales tax, so net Price would be $350.
check with Crutchfield to see it the unit for your car. you would still need a variety of harnesses and adapters to get this to work.