What type of monitor do you use? I just did some quick googling, and it looks like they're 2x as expensive as monitors that just have HDMI. It's possible that they're higher-end in other ways (resolution, brightness), but I paid about $120 for a 24" Samsung a couple years ago, and it looks like the cheapest Thunderbolt/USB-C monitor I can get is $190. But that's only 21", which is pretty small.