I came across an ebay listing before xmas for a Mame machine which has an ultra-wide LCD for the marquee. The listing has finished now and it hasn't been reposted but here is the link: Link
I've seen the lcd displays and always wanted one, but despite being an avid arduino fan (the relevance is half of arduino projects involved leds) I had never thought of this.
Here's the instructables if it's of interest to anyone instructable
Ali Express is about £16 a panel,
I just built a RPI2DMD for about £90 all in including 2 panels, pie 3, psu, and interface cardprof52020-01-28 14:30:43