Dell Alienware AW2521H 24.5" Full HD 1920 x 1080 360 Hz (Native with DP), 240 Hz (Native with HDMI) 1 ms (GtG) HDMI, DisplayPort, USB, Audio NVIDIA G-Sync Fast IPS Gaming Monitor - Newegg.com
Amazon.com: Alienware 240Hz Gaming Monitor 24.5 Inch Full HD Monitor with IPS Technology, Dark Gray - Dark Side of the Moon - AW2521HF : Electronics
Alienware 240hz Monitor 27 inch: AW2720HF | Dell USA
Alienware 27-Inch QHD Gaming Monitor: AW2721D | Dell USA
Dell Alienware AW2720HF, 27 Gaming Monitor - Full HD @ Native 240 Hz, 16:9, 1ms Response Time, DP, HDMI 2.0a, USB 3.0, AMD FreeSync, Tilt, Swivel, Height-Adjustable - Ard Al Ghadeer Trading LLC
Dell Alienware AW2720HF Review - RTINGS.com
Amazon.com: Alienware 240Hz Gaming Monitor 24.5 Inch Full HD Monitor with IPS Technology, Dark Gray - Dark Side of the Moon - AW2521HF : Electronics
240 Hz screen for Alienware Area-51m not coming until next year but there are plenty of other options - NotebookCheck.net News
Alienware 240hz Monitor 27 inch: AW2720HF | Dell USA
E3 2017: Alienware Announces 240 Hz Gaming Monitors: AW2518H (G-Sync) and AW2518HF (FreeSync) - PC Perspective