How to buy a 68 Cuda.

Look on the "Mopars for sale " part of FABO and see what your Duster ( or similar ) is selling for. Look on Ebay, I'd be willing to bet that the seller is looking for more.....and will get it from someone, if not you.

$1,500 is not realistic

But best of luck to you on it. Please let us know what transpires