B&H Photo has a solid deal on the Nikon D90 for $789 for the body only.

You can also pick up a kit with the D90 and 18-105mm VR lens for $1025.

Finally, you can take advantage of an instant rebate and get the D90, 18-105mm VR and 70-300mm VR lens for $1395.  The Nikon 70-300mm VR lens currently runs $540 by itself, so the rebate can save you real money.

To top it all off, B&H has free overnight shipping to get it to you in time for Christmas.

Amazon has the same prices for the Nikon D90, but with free 2-day shipping, so your time is a little more limited there.