I saw this a while back and thought of you so I hope maybe this could help out
https://www.ebay.com/itm/Lot-of-100-AUTHENTIC-NES-Super-Mario-Bros-Duck-Hunt-CART-ONLY-NOT-TESTED-/384351443163?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=711-127632-2357-0