You can sell on Amazon as an "individual" seller, but it's not recommended, as Amazon holds funds. I'm on there as a seller, probably will take off the things anyhow.
I sell locally with a local classified website. Or just get some word of mouth going around.
I also keep A9LH on the consoles, but I don't pre-install games - takes WAY TOO LONG. Although I did do that for someone requesting a few games that I had in my collection - private dumps of the games.