Holy giant monitors, Batman! Buy.com has a Westinghouse L2610NW-SP 26-inch LCD monitor for $249.99 shipped.
The specifications here are pretty solid: 1,920x1,200-pixel maximum resolution (that's 1080p to you TV fans out there), VGA and HDMI inputs (plus an HDMI-to-DVI cable), HDCP support (in case you want to pair it with, say, a Blu-ray player), and a one-year warranty.
Reviews of the L2610NW-SP are few and far between, but the Buy.com crowd was quite enthused by it (4.5 stars out of 5 on average), and Newegg buyers had mostly good things to say as well.
Given that I haven't seen a decent deal on even a 24-inch LCD in quite some time (the best ever was $199.99), a 26-incher for $250 seems like a major steal. Grab one before they're gone!