Ocean Technology via Amazon offers the Unitek Gold-Plated Mini DisplayPort to DVI Adapter in Black, model no. LYSB00Z6TEOKW, for $8.49. Coupon code "HQIPN7L8" drops it to $3.91. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $8.02.) That's $3 under what you'd expect to pay for a similar item in local stores. Compatible with Thunderbolt 2, it features gold-plated connectors and supports video resolutions up to 1920x1200 and 1920x1080 (1080p).