For instance, the BenQ XL2730Z is selling at Newegg for $629.99, and it kind of tells the story of FreeSync in a nutshell. It's a 27" monitor with a resolution of 2560x1440. The panel is of the TN variety and supports refresh rates from 40Hz to 144Hz with claimed 1-ms gray-to-gray response times.
Those specs are almost an exact match for our favorite G-Sync monitor, the Asus ROG Swift PG278Q, which is currently going for $779.99 at the 'egg.
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Notable among them is the Acer XG270HU, which shares the same core specs as the BenQ XL2730Z but lists for $100 less at $499. That's cheaper than Acer's comparable G-Sync display, too. The two ultra-wide panels from LG are a little weird, with 2560x1080 resolutions, but they're IPS panels capable of ranging from 48 to 75Hz. The 29" version lists for $449 and the 34" costs $649.
By the way, gamers with CrossFire are out of luck until some time in April when AMD plans to release a driver to enable FreeSync on CrossFire configurations. AMD's Catalyst 15.3 beta with full FreeSync support for single-GPU setups is expected very soon.