A good place to go for inexpensive DVDs is Hamilton Books. I used to buy a lot of books there before I had an ereader. They specialize in closeouts, discontinued products, etc., so it's difficult to predict what they'll have, but it should be inexpensive. For instance, right now they have the first season of Bat Masterson (B&W Western TV series starring Gene Barry) for $3.95. Shipping and handling charges are pretty reasonable.
https://www.hamiltonbook.com/dvds