Home Slickdeals Drop.com $20 off $30 – Koss Porta Pro X $10 shipped or... Slickdeals Drop.com $20 off $30 – Koss Porta Pro X $10 shipped or TWO Koss KSC75Xs $14 shipped, plus more By ARCOM - 18 November 2019 143 0 SHARE Facebook Twitter Go to the deal page: Drop.com $20 off $30 – Koss Porta Pro X $10 shipped or TWO Koss KSC75Xs $14 shipped, plus more