Best Buy has this 27" GIGABYTE IPS LED QHD FreeSync Monitor at $329.99 with nice features and capabilities, it is one of the best mid range 1440p monitor for now.
Amazon has 27GL650F-B 27 Inch Full HD Ultragear G-Sync Compatible Gaming Monitor with 144Hz Refresh Rate and HDR 10 - Black color for $246.99 which has good review and usually sells for $349.99
Dell has Dell UltraSharp U3419W 34" Curved USB-C Monitor: IPS with built in KVM for $647.99 with promo code "STAND4SMALL". Shipping is free.
BHPhotoVideo has LG 34WL850-W 34" QHD 21:9 UltraWide FreeSync Nano IPS Monitor for $999 - $250 coupon = $749. Shipping is free.