Im working on mine tonight as a matter of fact. Seen some of them on ebay for sale. i got mine at this place in Charlotte NC called Flashbacks Automobilia, they specilize in discontinued models like the cobra. i think it was 16 bucks. 704-568-5338
The old obsolete kit is p/n 85-2530. I am kicking myself in the butt for not buying at walmart when they were 8 bucks. It was gone form the Revell website long ago. Ebay brings in 15-35 for a kit, some guys sell them completly finished and painted on there. It is also availbe in a boxed set with 2 other mustangs for around 25-30.