All DSLR cameras do have an LCD display.
But most are only used for displaying the menu and displaying photos you have taken.

SLR cameras have always given you a through-the-lens viewfinder.
When you use the viewfinder, you are actually looking through the lens of the camera.

Only a few DSLR cameras have a Live View LCD, where you can see the scene on the LCD before you take the photo.

Right now, I can only find four that have "live view" LCD:
Canon 40D
Nikon D300
Olympus E410
Olympus E510

The lowest price DSLR camera is the Nikon D40 (6 megapixels)
Now they have a D40X with 10 megapixels

The lowest price Canon camera is the EOS 400D/Digital Rebel XTi

...
..
.