Round 2 just came out with a re-release of the 69 cuda in the original box art. Should be able to get one for around $25- $30, retail price at hobby stores.
Nice thing is bandit resins makes a 69 notchback bodyshell, interior tub, and back window to make it into one. Need the fastback kit for the chassis, engine, and rest of the detail parts. Pricey though