Depends on what kind of computer and TV you have. I don't know how well they work, but a VGA to component video breakout cable can be had for less than $30. My guess is it's passable.
A VGA to S-video or composite video can be had for $45-75.
Many laptops have an S-video out which should allow you just to connect it directly to your TV.
If you have an HDTV you'll be able to get a better picture since you can run higher resolution and could use the VGA out with an appropriate cable.
What kind of laptop do you have and what kind of outputs do you have off of it? What is the brand of TV you have to plug it into and what kind of inputs does it have?