You'll have a hard time getting money from some companies. Some shows are so old that they are released by private companies. They do not have the money or budget to make them captioned/subtitled. It's usually the more recent shows that are captioned/subtitled like The Simpsons or Star Trek: The Next Generation. Other companies that almost never make subtitled/captioned DVDs are usually independent companies: Two Left Shoes, City Head, etc...
They are independent and don't have the budget to make the subtitled. They might eventually begin doing it a few years later if they become more popular. If they release more than 10 copies at stores, they are more likely to be captioned/subtitled. If they release only 1 or 2 at stores, they are possibly likely to not be captioned/subtitled.
