Newegg has this Westinghouse 34" 3440x1440 2K Gaming Monitor, Usually sells for $449.99, but you can get it today for $349.99 with $4.99 shipping.
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.
Amazon has AOC CU34G2X 34" Curved Gaming Monitor, UltraWide QHD 3440x1440, 1ms 144Hz Freesync for $438.07. 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.