ubercake :
The fact of the matter is 1080p monitors are currently well over-priced for the most part. 1080p monitors are also the most popular monitors and most available these days. The industry doesn't want to lower the revenue stream from that type of monitor yet because they have a very efficient production process with this size panel. Until they lower the price of standard 1080p monitors, we won't see any special higher resolutions for reasonable prices.
1080p is "over-priced"?
You can buy some 1080p's for as little as $100 and that is part of the reason higher-resolution screens are so much more expensive: rock-bottom prices on 1080p makes justifying paying well over twice as much for slightly higher resolution very hard to justify for most people. This effectively turned anything above 1080p into a niche market and lead to the general lack of any down-pricing pressure on anything higher.
A few years ago, while 1080p screen prices were still around the $200-250 range, you could find decent 24" 1200p screens for $250-350. These days, most 1200p screens are over $350 and most of them restrict input choices to VGA and DVI... so the average 1200p screen today is more expensive and less functional than those from 3-5 years ago.