Recently I bought 2 72pins connectors from this real good ebayer (THE POWERSTORE - Amsterdam)
And after the two items came in I asked him if he could get me a converter to play FAMICOM games on my NES.
He couldn't but he had some games he would offer me without ebay involved.
I finally purchased some:

Operation Wolf            € 6,00  (boxed)
Wrath of the Black manta            € 2
Wrestlemania            € 2
Festers Quest             € 3,50
Knight Rider              € 4