Really? I found my 05 gt in one day just going around town looking for mustangs for sale. Had 51k on it and had one owner got it for 15kIt took me 2 years to find mine. New Edge GTs always get beat on. It's damn near impossible to find one that isn't damaged and that has a reasonable price tag. If you can, usually it's a private seller and you have to pay in full up front. That's kinda hard to do since a bank won't give out loans on vehicles that old unless you borrow against your own money and don't tell them why.
Stay persistent and don't get discouraged. There's one out there, just don't settle or you'll regret it.
The worst part is that after you buy one, you'll see 5 more nice ones for sale that same week.