Here is a DVD that I recently sold on Amazon fulfillment. Not everything I sell is a huge money maker. In fact this type of item is my bread and butter.
This DVD is from 2010 and at that age DVDs are usually not worth anything. But using my Amazon seller scanning app on my iPhone, I was able to determine that I could profit from this one. If it had been a $3 DVD as most are at Half Price Books, I would not have bought it as I like to try to make at least 4 times what I pay for an item, if it is a lower priced item.
They apparently did not mass produce this one, so the market is not flooded. It had a good Amazon sales rank of around 6,000 and sold within a week of me shipping it to the warehouse. I typically try to only buy DVDs with a sales rank of less than 100,000.