Judelson said he now provides his nearly 300 subscribers with 1-ounce and 2 1/2 -ounce salt jars, which range from Pure Amagansett Sea Salt to varieties like Wasabi, Sesame and Nori, or Espresso, Black Pepper and Cayenne.
"Our subscription box business has grown in pace with our general sales, 30 percent every year," he said. "We like this business model; it's recurring and predictable. It allows us to plan."
Camissa Matson-Gallagher and Emma Brandt, both of Huntington, run an inspirational-events business, A Mighty Lass. They also recently launched The Mighty Box, a $29.95 box featuring girl-empowerment items linked to monthly themes like "Dream It. Plan It. Work It."
"We wanted to find a way to give young girls a monthly dose of empowerment," said Emma Brandt, whose home garage has become a mini-warehouse. Small white cardboard boxes lining the walls are full of weekly planners, pens that read "goal getter" and "work hard," sticky notes with affirmations, and a #HerMoment notecard featuring a subscriber's Q&A with a female entrepreneur.
Matson-Gallagher said the box is a "great follow-up" for events and a way to stay connected to their audience.
"We're also planning on retailing the products in our box on our website," she said. "It gives us much more breadth for income, which is great for a company that only derives revenue a few times a year."
Large companies like Target, Walmart and adidas have also launched subscription boxes. That leads some experts to wonder whether the market will soon reach saturation.
"Beauty boxes are the most saturated" type, said Jesse Richardson, who offers weekly webinars at Cratejoy's Subscription School and founded Prospurly, a small-batch and organic-goods box.
But boxes that fill a need or a specific niche still have room to grow, he said: "We're nowhere near the peak."