Monoprice offers its Monoprice 30" CrystalPro IPS LED-Backlit LCD Monitor with Adjustable Stand for $478.24 plus $32.58 for shipping. That's $79 under our mention from August and the lowest total price we've seen. (It's purported to be the same panel as the Apple Cinema displays.) Features include a 2560x1600 native resolution, LED backlight, and DVI-D input.
Frugal isn't smart if you put off replacing these things. Waiting too long can cost money or even endanger your health.