Is there anywhwere where i can sell Music Keyboard, etc?

i have an old casio keyboard that stores don't even want to trade, i also have a bunch of computer peripheral, some AC adapters, some software. can i make money off these, or shsould i just toss them to the trash?I even have a computer that i don't use anymore but i'm sure it works. G3 macintosh computer. note, i don't do ebay stuff or anything like that so no thanks.