Home Slickdeals Korg TM50BK Instrument Tuner and Metronome, Black – $14.99 & FREE... Slickdeals Korg TM50BK Instrument Tuner and Metronome, Black [Black] – $14.99 & FREE Shipping on orders over $25. By ARCOM - 10 January 2018 221 0 SHARE Facebook Twitter Go to the deal page: Korg TM50BK Instrument Tuner and Metronome, Black [Black] – $14.99 & FREE Shipping on orders over $25.