If you're looking for something really cheap, try to get a used portable DVD player that supports TV-IN. You may have to buy a cheap generic splitter, costs like $3 with shipping or less. That's what I do and it works, not the best quality though but then again my DVD player is probably at least 4 years old or so. Not sure how good the new ones are, regardless it works but typically the screen size won't be larger than 8 inches.