navigation for 2006 Lincoln Mark Lt

I want to put nav in my truck but have no idea what it's gona cost me.  Any help PLEASE  

Depends...Do you want the factory set-up that you could get as an option, or an aftermarket unit? I'd check out Crutchfield if it's the latter.  

Still undecided, but if i do go factory it'll b '08 or newer nav system. which makes me wonder if the '09 nav system will fit without to much hassel etc.... Do you have any ideas of which aftermarket units are top notch?  

check out ebay they always have some oem nav units for a good price compared to at the dealership.  
-Cody

There are a lot of people that like the Pioneer AVIC units, but they're not the only game in town.  

thanks.  wood a salvage yard be worth my time or would I Just be wasting my time?  

salvage yard would probably charge you a little bit more than ebay. however, they will be much less than a dealership, in most cases anyways.  make some phone calls to some salvage yards and tell them what you are looking for.  good luck!  
-Cody