Not sure if this is helpful but, I just got a 25 inch 21:9 monitor for a Digital marquee to use with a MAME cab. Its the LG 25um65. Its a little over 24 inches wide and 11 inches tall. I had been considering an ultra wide monitor, but found that they were way out of my price range until I found this. I actually picked this one up for $219 + tax at Costco. Not sure how wide you wanted it, but its with in the range of a standard Marquee. The best part is its an IPS panel with Good Angles.. so it doesnt seem dim or blurry off angle.
keep an Eye out for it ...