Ocean Technology via Amazon offers the Unitek Mini Port DP to HDMI Converter for $9.96. Coupon code "UOMKTL52" drops it to $4.99. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $8.) That's $25 off list and the lowest total price we could find. It transmits both audio and video from a computer or tablet to an HDTV display, and supports full HD 1080p resolution. Deal ends October 15.