Use Amazon coupon code KH7QRYBW
Amazon has this TaoTronics 3.5" LCD Rearview Monitor for Backup Camera for $24.99 after instant savings. Use code KH7QRYBW
at checkout and the price drops to $14.99. Shipping is free for Prime members or with orders of $35 or more, otherwise shipping adds $5.28. Please note that this is a monitor to connect to your existing backup camera.