They made a 73, 74 and a 75 but I don't think they made a 76 I will check and see. I think I have an extra 74 builder but I know I don't have an extra box, boxes can go for as much as the car itself though.
Mint kits are pricey but if you want to build it I wouldn't buy a mint kit, there are plenty of clean builders out there for around $35-$50 and it is ridiculous to build a 35 year old mint kit.
If you aren't woried about a stock interior then it may be easier to find a Sox & Martin Duster or the Mopar Missile, they are rare kits as well but there are more of them out there.