Karaoke USA GF840 Portable System: New $99.99, Used – Very Good $42.22 (limited stock) + Free Shipping ~ Amazon By admin | August 7, 2018 11:11 pm EST 0 Comment Karaoke USA GF840 Portable System New $99.99 Used – Very Good $42.22 (Limited Stock) Note, may have cosmetic imperfections, see listing for full details.