NOS 1973 DUSTER DART TWIN SNORKEL SCOOP......WHATS A FAIR PRICE??

I paid $600.00 for a nice 72 one, but there a little harder to find than the 73-74 with the two part numbers and cutout for the peak in the hood.
Hmmmm.....im not sure what this year is for exactly?? Ill need to check that out later, see if it has the triangle cutout or not! Thanks