Store4PC via Amazon offers the Sabrent Mini DisplayPort to HDMI Adapter, model no. DA-DPHD, for $9.99. Coupon code "JUL4DPHD" cuts it to $4.99. Plus, Prime members bag free shipping. (Non-Prime members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $8.02.) That's $20 off list and the lowest total price we could find. It features full audio support and is compatible with a range of Mac laptops and desktops.