Check out this project on RYOBI Nation - Needed a baby gate for the top of our basement stairs. I took out the existing basement door, and placed a 29" by 36" wooden baby gate. Made from 1x4 common boards, sanded it down, stained it Golden Oak, screwed it together with 1.25" wood screws, used a gate latch also.
$99 Freestanding Wooden Pet Gate: This beautifully crafted Freestanding Wooden Pet Gate is unlike the cumbersome gates of the past. Our solid mahogany gate limits your pet's access to certain areas of your home without creating the distraction of an imposing blockade.