Rakuten.com Shopping has the Crossover 27QW 27" IPS LED PC Monitor for $319 with free shipping. Features an LG QHD AH-IPS LED-backlit panel; product description says not compatible with Mac but reviewers have had different experiences (YMMV). eBay with AccessoriesWhole has it for the same price with free shipping.
2560x1440 resolution, 420cd/m2 brightness, 6ms response time 1000:1 contrast ratio, 178° viewing, DVI-D Dual-Link input only
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