"Are we there yet?"
"Mom, Tommy keeps moving to my side of the seat!"
"Dad, I'm hungry. And I have to go to the bathroom … again"
"I'm bored."
"I feel carsick."

Anyone who has been on a long family road trip -- either as a parent or as a child -- has likely heard sentences like these too many times to remember.

More and more parents have been choosing over the last five years to cut down on the back seat bickering with a mobile video system -- a video screen with wireless headphones and a DVD player.

"Families put their kids in front of TVs at home to keep them quiet, and it's the same thing in the vehicle," said Alan Anderson of Best Buy, who described his title as Auto Tech Secret Weapon. "It's getting pretty popular. Prices are even coming down on them versus five years ago."

Many auto companies now have systems that can be installed at the factory when you buy a car. But for drivers who want to get a system custom installed, there are many options -- including satellite TV for your car.

Just like setting up a home theater, prices can vary from reasonable to extravagant.

Hundreds To Thousands Of Dollars

"You can go from your basic portable video player that runs a couple hundred dollars, and you can go all the way up to a couple thousand for an installed advanced video system," said Anderson.

There are three basic options about where to hook up a screen: in-dash, overhead and on a headrest.

In-dash screens have limited use because most states do not allow a video screen visible from the front seat to be turned on except for navigation-system use. Anderson said most states only allow the video screen to be used for a recreational purpose when the car is parked.

The options for the back seat typically involve installing the video screen on the headrest or hanging from the ceiling.

"You have the overhead, which is the most popular, where you actually cut into the headliner of the vehicle," said Anderson. "Then there is the headrest, where you either replace the headrest with a whole new headrest with the screen already in it or you're cutting into the existing headrest."

Anderson said installation typically costs around $200, plus the parts. And like a regular television, the price can be a low as a few hundred dollars and as high as a few thousand. Sizes of the screen average between 10 and 20 inches.

How Do You Hear?

For audio, most systems come with a set of wireless headphones, and the system can also be played on the car's speakers through a wireless FM adapter.

And for the family that is constantly on the go that has already run through every DVD in the collection, satellite or cable TV is also now an option.

Sirius Satellite, along with its well-known radio stations, offers Back Seat TV. The channel options are limited and aimed strictly at the kids.

You get Nickelodeon, the Disney Channel and the Cartoon Network, and the cost is $299.99 for the parts and $6.99 per month, in addition to a regular Sirius Radio subscription of $12.95 a month.

Anderson said Best Buy will install the system for $149.99.