previous abandoned cars that I have missed, because I just started playing Payback two weeks.
Right oh

The original batch (RX7; Barracuda; 242; Amazon; E30 M3; 2000gt Skyline) are available to buy. They might appear on the map again, but in the mean time they are there for purchase. The current run will doubtless repeat itself, but it's a longer list so patience is keep. A regular update will be placed in this thread so feel free to keep an eye out

At the minute the Raptor is up with the silvia likely to be next. There is a distinct possibility (no guarentee) that the Pagani will drop the week after. If you want an easier time you might want to wait for it to drop.
Also Came across this on
http://nfs.wikia.com/wiki/Need_for_Speed:_Payback/Abandoned_Cars
Cars
The ones we know about are the boss cars
La Catrina 240Z
Udo Roth Subaru Impreza
Big Sister Mustang
Underground Soldier Skyline R32
Gallo Rivera 911RSR
(all of the above have passed)
Faith Jones Raptor (currently up)
Aki Kimura Silvia
Natalia Nova Pagani
Holtzman C10
Mitko Vasiles GTR R35
and
Legacy cars
RX7
Amazon
242
Barracuda
E30 M3
2000GTR
So far 2 unique and non payback cars have dropped
LR Defender Shark Attack
Cop Car
That leaves these to come (not counting the remaining payback boss cars)
M3 E46 (Razor) NFS Most Wanted
Dodge Challenger SRT8 (Cold Rim) Unique
Ford Roadster (Halloween) Unique
F Type R (St Patrick) Unique
Diablo SV (New Years) Unique
Exige S (Love Mobile) Unique
MB G63 (Santa Clause) Unique
Nissan 350z (Rachel Teller) NFS Underground
Looking at the list we are due some festive cars, and 2 homage cars. The only standout is the SRT8. Anyone any clues?